The interpretation timeline
Leviticus 19:10 Douay-Rheims

Neither shalt thou gather the bunches and grapes that fall down in thy vineyard, but shalt leave them to the poor and the strangers to take. I am the Lord your God.

A.D. 215 – 1849 4 witnesses

Patristic

before A.D. 750
215
A.D.
c. A.D. 150–215
“During the harvest, [the law] forbids owners to gather up the bits which fall from the sheaves and similarly advises that in harvesting something should be left behind unreaped. By this it gives excellent teaching to owners in the practice of generous sharing by leaving some of their property for those in need and providing the poor with a chance for food. Do you see how the law proclaims simultaneously the justice and goodness of God, who provides food unstintingly for all? Again, in the grape harvest the harvesters are forbidden to go back and cut anything that has been left over or to collect fallen grapes. The same rules are applied to olive gatherers. In fact the principle of tithing crops and flocks was an education in honoring the divine. We are not to be totally absorbed by profit but to share humanely with the neighbor as well.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
לא תעולל AND THOU SHALT NOT GLEAN [THY VINE YARD] — (עלל is a verb connected with the noun עולל "young, tender, not developed"; cf. Samuel 15:3: עולל ויונק) thus לא תעולל means, thou shalt not take the tender grapes of it. They can be recognized as such from the description given in Mishna Peah 7:4 (cf. also Sifra, Kedoshim, Chapter 3 3) where it is stated: What are עוללות? Clusters which have neither כתף, “arms" nor נטף, "drippings". ופרט כרמך [NEITHER SHALT THOU COLLECT] THE FALLEN GRAPES OF THY VINE YARD — i. e. the single berries of the grapes which fall to the ground during the grape gathering. אני ה'‏‎‎‎‎‎ אלהיכם I AM THE LORD YOUR GOD — the Judge Who am certain to punish if necessary and Who for the neglect of these duties will exact from you nothing less than your souls, as it is said (Proverbs 22:22, 23) "Rob not the poor… for the Lord will plead their cause, [and spoil the soul of those that spoiled them]" (Sifra, Kedoshim, Chapter 3 7).”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And thou shalt not glean thy vineyard,.... Or cut off the little clusters which are, as Aben Ezra observes, like an infant, as the word signifies, infant clusters, which were small in comparison of the large ones, as infants are to men; those which had but a grape or two, or very few upon them, were not to be cut off, but left for the poor: and Gersom says, if the whole vine consisted of such clusters, it all belonged to the poor: neither shall thou gather every grape of thy vineyard; every particular single grape; these were such as were left on the vine after the large clusters were gathered, and a man upon viewing it again might not gather such as had only a single grape or two upon them; for the Misnic doctors say (s), two grapes or berries make a "peret" (the word here rendered "every grape"), but three do not; so that if there were three grapes upon a cluster it was the owner's, and might be gathered, but if fewer, then it belonged to the poor; or this may be understood (t) also of such single grapes that fell to the ground in gathering, which might not be taken up by the owners, but were to be left to the poor; and, as Gersom says the grape gatherers might not put a bushel under the vines in the time of gathering, to catch the single grapes that fell: thou shall leave them for the poor and stranger: for the poor Israelite, and the stranger that sojourns with you, as Aben Ezra interprets it; the stranger intends a proselyte, not a proselyte of the gate, but a proselyte of righteousness, as Gersom and it is a rule laid down by Maimonides (u), that every stranger spoken of concerning the gifts of the poor is no other than a proselyte of righteousness, one that has been circumcised upon embracing the Jewish religion, and agreeing to conform to all the laws and rituals of it; though the same writer observes, that they do not restrain the poor of the Gentiles from these gifts, but they are in general included among the poor of Israel; and they come and take them because of the ways of peace; for the sake of peace, to promote peace and harmony among them: I am the Lord your God; that gave them fields and vineyards, and times of harvest, and vintage, and blessed them with fruitful seasons, and therefore had a right to require such things of them; and they were in duty and gratitude bound to observe his commands; and this shows his regard unto, and concern for the poor, and that he is the father and patron of them. (s) Maimon. & Bartenora in Misn. Peah, c.6. sect. 5. (t) So it is interpreted by R Sol. Urbin. Ohel Moed, fol. 59. 1. (u) Mattanot Anayim, c. 1. sect. 9.”
Source
1849
A.D.
1774–1849
“Strangers . Septuagint and Syriac, “proselytes,” who might dwell in the country. As the soil did not belong to them, great compassion was requisite: otherwise they must have perished, or become slaves. — Lord; the sole proprietor. (Calmet)”
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.