John Gill Bible Commentary

When thou gatherest the grapes of thy vineyard,.... Which was done much about the same time that the olives were gathered, and both after wheat harvest, about the latter end of June, or beginning of July; for they were more forward in those hot countries: thou shall not glean it afterwards; go over the vines a second time, to pick off every berry or bunch that escaped them at first gathering: it shall be for the stranger, for the fatherless, and for the widow; as the forgotten sheaf, and the olive berries left; these are all supposed to be poor persons, otherwise no doubt there were strangers, and fatherless persons, and widows, in good circumstances; who, as they needed not, so neither would give themselves the trouble, but think it beneath them to go into fields, oliveyards, and vineyards, to gather what was left by the owners. These laws were made in favour of the poor, that mercy and kindness might be showed to them, and that they might have a taste of all the fruits of the earth.