The interpretation timeline
Luke 9:49 Douay-Rheims

And John, answering, said: Master, we saw a certain man casting out devils in thy name, and we forbade him, because he followeth not with us.

A.D. 397 – 1871 9 witnesses 10 excerpts

Patristic

before A.D. 750
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“Now John is not blamed, because he did this from love, but he is taught to know the difference between the strong and the weak. And therefore our Lord though He rewards the stronger, yet does not exclude the weak; as it follows, And Jesus said unto him, Forbid him not, for he that is not against you is for you. True, O Lord. For both Joseph and Nicodemus, through fear Thy secret disciples, when the time came, did not refuse their offices. But still since Thou saidst elsewhere, He that is not with me is against me, and he that gathereth not with me scattereth, (Luke 11:23.) explain unto us lest the two seem contrary to one another. And it seems to me, if any one considers the Searcher of hearts, he cannot doubt that every man’s action is distinguished by the motive of his heart.”
Source
“Now why does He in this place say that they are not to be hindered, who by the imposition of hands can subdue the unclean spirits, when according to Matthew, He says to these, I never knew you? (Matt. 7:23.) But we ought to perceive that there is no difference of opinion, but that the decision is this, that not only the official works but works of virtue are required in a priest, and that the name of Christ is so great, that even to the unholy it serves to give defence, but not grace. Let no one then claim to himself the grace of cleansing a man, because in him the power of the eternal Name has worked. For not by thy merits, but by his own hatred, the devil is conquered.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“(Hom. 41. in Matt.) For in the other place when He said, He that is not with me is against me, He shews the Devil and the Jews to be opposed to Him; but here He shews that he who in Christ’s name cast out devils, is partly on their side.”
735
A.D.
Bede the Venerable Patristic
c. A.D. 672–735
“Or, because they saw Peter, James, and John, taken apart to the mount, and the keys of the kingdom of heaven promised to Peter, they were angry that these three, or Peter, should have precedence over all; or because in the payment of the tribute they saw Peter made equal to the Lord, they supposed he was to be placed before the rest. But the attentive reader will find that the question was raised among them before the payment of the penny. For in truth Matthew relates that this took place at Capernaum; but Mark says, And he came to Capernaum, and being in the house, he asked them, What was it that ye disputed among yourselves in the way? But they held their peace; for by the way they had disputed among themselves who should be the greatest. (Mat. 18:24, Mark 9:33.)”
Source

Scholastic

c. 1100 – 1500
1107
A.D.
c. 1055–1107
“Because then our Lord had said, He who is least among you all, the same shall be great, John feared, lest perhaps they had done wrong in hindering a certain man by their own power. For a prohibition does not shew the probitor to be inferior, but to be one who thinks himself somewhat superior. Hence it is added, And John answered and said, Master, we saw one casting out devils in thy name, and we forbad him. Not indeed from envy, but to distinguish the working of miracles, for he had not received the power of working miracles with them, nor had the Lord sent him as He did them; nor did he follow Jesus in all things. Hence he adds, because he followeth not with us.”
Source

Reformation

c. 1500 – 1650
1637
A.D.
1567–1637
“And John answered and said , Master , we saw one easting out devils in Thy name ; and we forbad himy because he followed not with us , i.e. because he was not Thy disciple. For he thought that only the Apostles, to whom that power was given, were permitted to do this. Cyril and S. Ambrose remark, “ He thinks that he who does not render obedience, should not enjoy the benefit arising therefrom.” S. John asks the question, because from his love he was the more zealous for his Master’s honour”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And sent messengers before his face,.... Who very likely were his two disciples, James and John, since they so highly resented the ill treatment their master met with from the Samaritans: and they went; before him: and entered into a village of the Samaritans; or "city", as the Vulgate Latin, Persic, and Ethiopic versions read, and so one of Stephens's copies; which lay in the way from Galilee to Judea, where the disciples had been forbid to enter, that is, in order to preach, Mat 10:5 To make ready for him; to prepare a lodging, and proper food for him and his disciples, as they passed on in their journey, for his intention was not to make any stay there.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“We forbade him - See this subject considered on Mar 9:38 (note), etc.”
1849
A.D.
1774–1849
“We forbade him. St. John having the most love for his Lord, and being particularly beloved by him, thought all were to be excluded from these gifts, who were not obedient to his divine Master. (St. Augustine) — But we must remember, that not the minister is the author of these miracles, but the grace which is in him, who performs these wonders by virtue of the power of Christ. (St. Cyril) — How wonderful is the power of Christ, who by his grace works miracles in the persons of the unworthy, and those that are not disciples; as men are sanctified by the priest, though the priest should not be in the state of grace! (Theophylactus)”
Source
1871
A.D.
1871
“John answered, &c.--The link of connection here with the foregoing context lies in the words "in My name" (Luk 9:48). "Oh, as to that," said John, young, warm, but not sufficiently apprehending Christ's teaching in these things, "we saw one casting out devils in Thy name, and we forbade him: Were we wrong?" "Ye were wrong." "But we did because he followeth not us,'" "No matter. For (1) There is no man which shall do a miracle in My name that can lightly [soon] speak evil of Me' [Mar 9:39]. And (2) If such a person cannot be supposed to be 'against us,' you are to consider him 'for us.'" Two principles of immense importance. Christ does not say this man should not have followed "with them," but simply teaches how he was to be regarded though he did not--as a reverer of His name and a promoter of His cause. Surely this condemns not only those horrible attempts by force to shut up all within one visible pale of discipleship, which have deluged Christendom with blood in Christ's name, but the same spirit in its milder form of proud ecclesiastic scowl upon all who "after the form which they call a sect (as the word signifies, Act 24:14), do so worship the God of their fathers." Visible unity in Christ's Church is devoutly to be sought, but this is not the way to it. See the noble spirit of Moses (Num 11:24-29).”
Source
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.