The interpretation timeline
Colossians 4:1 Douay-Rheims

Masters, do to your servants that which is just and equal: knowing that you also have a master in heaven.

A.D. 407 – 1863 8 witnesses

Patristic

before A.D. 750
date
unknown
c. A.D. 100
“Thou shalt not enjoin aught in thy bitterness upon thy bondman or maidservant, who hope in the same God, lest ever they shall fear not God who is over both; for he cometh not to call according to the outward appearance, but unto them whom the Spirit hath prepared.”
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“What is "just"? What is "equal"? To place them in plenty of everything, and not allow them to stand in need of others, but to recompense them for their labors. For, because I have said that they have their reward from God, do not thou therefore deprive them of it. And in another place he saith, "forbearing threatening" (Eph. vi. 9), wishing to make them more gentle; for those were perfect men; that is, "with what measure ye mete, it shall be measured unto you." (Matt. vii. 2.) And the words, "there is no respect of persons," are spoken with a view to these, but they are assigned to the others, in order that these may receive them. For when we have said to one person what is applicable to another, we have not corrected him so much, as the one who is in fault. "Ye also," along with them, he saith. He has here made the service common, for he saith, "knowing that ye also have a Master in heaven."”
Source

Scholastic

c. 1100 – 1500
1272
A.D.
Thomas Aquinas Catholic
1225–1274
“Once the general instruction to all has been laid down, here he begins to set down the special instruction. First he gives certain special teachings pertaining to the individual states within the Church; second, certain teachings common to all states with respect to certain conditions, in chapter IV, at "be instant in prayer." The first is divided into three, according to the three bonds from which a household is constituted, according to the Philosopher: of which one is that of husband and wife; the second, of father and son; the other, of master and servant. The second is at "children." The third, at "servants." Each of these is divided into two, according as he admonishes the subjects to obey, and the superiors to command with moderation. He therefore says wives, etc., and he says as is fitting, because this subjection is ordained by divine law. Gen. 3:16: "you shall be under your husband's power, and he shall have dominion over you." 1 Cor. 14:34: "let women keep silence in the churches, for it is not permitted them to speak, but to be subject, as the law also says." And the reason for this is that to rule belongs to reason; but men are stronger in reason, and therefore ought to preside. Likewise he adds in the Lord, because all things ordained to certain ends must be referred finally to God. Then he admonishes the husbands to love them, saying husbands, love your wives, for this is natural, since husband and wife are in a certain way one. Eph. 5:25: "husbands, love your wives," et cetera. And he forbids that they be bitter toward them. Mic. 1:12: "she who dwells in bitterness has grown weak unto good." Eph. 4:31: "let all bitterness, and anger, and indignation, and clamor, and blasphemy be taken away from you, with all malice." Then when he says children, etc., he deals with the second, and says children, obey in all things, namely, those things which are not against God. Heb. 12:9: "we have indeed had the fathers of our flesh for instructors, and we reverenced them," et cetera. But if they should command in matters that are against God, then that saying is to be understood which is said in Lk. 14:26: "if anyone comes to me and does not hate his father and mother," et cetera. And this, because this is well-pleasing to the Lord, that is, according to the law of the Lord, because the law of charity does not remove the law of nature, but perfects it. Now it is a law of nature that the son be subject to the care of the father. Ex. 20:12: "honor your father and your mother," et cetera. Then when he says fathers, do not, etc., he instructs the parents. Eph. 6:4: "and you, fathers, do not provoke your children to wrath," et cetera. And this, lest they become of small spirit, that is, lest they become fainthearted. And the reason for this is that men retain the impression which they had from childhood. Now it is natural that those who are reared in servitude should always be fainthearted. Whence a certain one gives this as the reason why the children of Israel were not led at once into the land of promise: because they had been reared in servitude, and would not have had the boldness to fight against enemies. Is. 35:4: "say to the fainthearted," et cetera. Then when he says servants, obey, he deals with the third; and first he sets down the admonition concerning servants; second he shows the reason, at knowing; third he excludes a doubt, at for he who. Concerning the first he does two things: first he admonishes them to obedience; second he determines the manner of obeying, at not to the eye. He says therefore servants, according to the condition of the flesh, obey in all things, namely those things which are not against God. 1 Pet. 2:18: "not only to the good and gentle, but also to the froward," et cetera. 1 Tim., last chapter: "whoever are under the yoke of servitude, let them esteem their masters worthy of all honor." Then when he says not to the eye, he teaches the manner of obeying. And he shows two manners of obeying: first, that it be simply and without deceit; second he shows that it be willingly. He says therefore not to the eye, namely, only insofar as it can be seen by the master. Eph. 6:6, similarly. And he says as pleasing men, because they serve in this manner only so as to please men. Gal. 1:10: "if I still pleased men, I would not be a servant of Christ." Therefore he adds but in simplicity of heart, etc., that is, without deceit, fearing the Lord, as in Job 1:1: "that man was simple and upright, and fearing God." Prov. 11:3: "the simplicity of the just shall guide them," et cetera. Likewise, willingly; hence he says whatsoever you do, from the heart, that is, readily, work. And this as to the Lord, because he who serves someone on account of the order of justice does this on account of God, from whom this order comes. Rom. 13:2: "he who resists authority resists the ordinance of God." Eph. 6:6: "doing the will of God from the heart, serving with good will, as," et cetera. Then when he says knowing, he shows a twofold reason for this: one on the part of reward, the other on the part of devotion to God. He says therefore: serve readily, because from the Lord you will receive the recompense of an eternal inheritance. Ps. 15:6: "the lines have fallen unto me in goodly places, yea, my inheritance is goodly unto me." Eph. 6:8: "knowing that whatsoever good thing each one shall have done, this he shall receive from the Lord, whether servant or free." For it was the opinion of some that an act of justice is not meritorious, because this seemed to be owed, and it is not meritorious to give someone what is his own. But it must be known that from the fact that you do it willingly, from this you put in something of your own, because it is within your power to will or not to will, and thus it is meritorious. Servants, however, serve their master out of debt, and therefore, that they may have a reward, they do this willingly. But serve them in such a way that you do not withdraw from God. Likewise another reason is that in this way you serve the Lord Christ. Rom. 12:11: "fervent in spirit, to the Lord," et cetera. Then when he says for he who, he removes a doubt. For a servant might say: how shall I serve one who does me wrong? And so he says: it is not yours to avenge yourself, by withholding from him what is his, but await it from him who is able, because he who does wrong, et cetera. 2 Cor. 5:10: "for we must all be made manifest before the judgment seat of Christ, that each may receive the things proper to the body, according to what he has done, whether good or evil." Eph. 6:9: "and there is no respect of persons with God." Acts 10:34: "God is not a respecter of persons." Then when he says masters, he shows how masters should conduct themselves toward servants. And concerning this he does two things: first he gives the teaching; second he renders the reason for it, at knowing. Now a master can burden his servants in two ways: namely, by doing against them what the justice of the law forbids, since according to the laws it is not lawful for a master to be savage toward a servant. Therefore he says what is just. Likewise, if he should exact the whole debt, which Christian gentleness mitigates. Therefore he says and equitable. Job 31:13: "if I have despised to submit," et cetera. Then when he says knowing, etc., the reason is given, because as you conduct yourself toward them, so the Lord toward you. Eph. 6:8: "knowing," et cetera.”

Post-Reformation

c. 1650 – 1900
1714
A.D.
Matthew Henry Reformed
1662–1714
“The apostle proceeds with the duty of masters to their servants, which might have been joined to the foregoing chapter, and is a part of that discourse. Here observe, 1. Justice is required of them: Give unto your servants that which is just and equal (Col 4:1), not only strict justice, but equity and kindness. Be faithful to your promises to them, and perform your agreements; not defrauding them of their dues, nor keeping back by fraud the hire of the labourers, Jam 5:4. Require no more of them than they are able to perform; and do not lay unreasonable burdens upon them, and beyond their strength. Provide for them what is fit, supply proper food and physic, and allow them such liberties as may fit them the better for cheerful service and make it the easier to them, and this though they be employed in the meanest and lowest offices, and of another country and a different religion from yourselves. 2. A good reason for this regard: "Knowing that you also have a Master in heaven. You who are masters of others have a Master yourself, and are servants of another Lord. You are not lords of yourselves, and are accountable to one above you. Deal with your servants as you expect God should deal with you, and as those who believe they must give an account. You are both servants of the same Lord in the different relations in which you stand, and are equally accountable to him at last. Knowing that your Master also is in heaven, neither is there respect of persons with him," Eph 6:9.”
Source
1771
A.D.
John Gill Reformed
1697–1771
“Masters, give unto your servants,.... This verse properly belongs to the preceding chapter, with which it should have been concluded. It is indeed strange, that those who made the division of chapters and verses should separate this from the former chapter, to which it so manifestly belongs, and begin a new one with it, when it has no connection with what follows; for the apostle having observed the duty of servants to their masters, proceeds to direct masters to the discharge of their duty to their servants, by giving them that which is just and equal: proper food and raiment, which is sufficient and fitting for them; the wages due unto them by law or contract; using them with gentleness and humanity, taking care of them when under affliction, and in sickness; encouraging the diligent and laborious by an addition to their salaries; correcting the disobedient within just bounds, not with too much rigour and severity; and carrying it with an even hand to all, not preferring or indulging one before another, without any reason: knowing that ye also have a master in heaven: See Gill on Eph 6:9.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Masters, give unto your servants - This verse should have been added to the preceding, to which it properly belongs; and this chapter should have begun with Col 4:2. That which is just and equal - As they are bondmen or slaves of whom the apostle speaks, we may at once see with what propriety this exhortation is given. The condition of slaves among the Greeks and Romans was wretched in the extreme; they could appeal to no law; and they could neither expect justice nor equity. The apostle, therefore, informs the proprietors of these slaves that they should act towards them both according to justice and equity; for God, their Master, required this of them, and would at last call them to account for their conduct in this respect. Justice and equity required that they should have proper food, proper raiment, due rest, and no more than moderate work. This is a lesson that all masters throughout the universe should carefully learn. Do not treat your servants as if God had made them of an inferior blood to yours.”
Source
1849
A.D.
1774–1849
“Masters should remember that they also have a Master to whom they must reckon, and from whom they must expect the same justice they measure out to others.”
1863
A.D.
1796–1863
“This verse more proi^erly belongs to the preceding chapter. The apostle in- culcates to masters such treatment of their servants as may be just in itself, and equal to their deserts.”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.