Charles Ellicott Commentary Deuteronomy 23:24

"When thou comest into thy neighbor`s vineyard, then thou mayest eat of grapes thy fill at thine own pleasure; but thou shalt not put any in thy vessel." — Deuteronomy 23:24 (ASV)

When you come into your neighbour’s vineyard. —Rashi tries to limit both this and the following precept to the labourer engaged in gathering the vintage or the harvest, when vessels are used and sickles employed. But the plain meaning will stand, and is accepted by our Lord in the Gospel. The objection made to His disciples was not that they plucked their neighbour’s corn, but that they did it on the Sabbath (a kind of harvesting, and therefore unlawful according to the scribes).