Leviticus 19:9-10

9And when ye reap the harvest of your land, thou shalt not wholly reap the corners of thy field, and the gleaning of thy harvest thou shalt not gather.

10And thy vineyard shalt thou not glean, neither shalt thou gather what hath been left of thy vineyard; thou shalt leave them for the poor and the stranger: I am Jehovah your 1God.