Deuteronomy 24:19-22

19When thou reapest thy harvest in thy field, and forgettest a sheaf in the field, thou shalt not return to fetch it; it shall be for the stranger, for the fatherless, and for the widow; that Jehovah thy 1God may bless thee in all the work of thy hands. 20When thou shakest thine olive-tree, thou shalt not go over the boughs again; it shall be for the stranger, for the fatherless, and for the widow. 21When thou gatherest the grapes of thy vineyard, thou shalt not glean it afterwards; it shall be for the stranger, for the fatherless, and for the widow. 22And thou shalt remember that thou wast a bondman in the land of Egypt; therefore I command thee to do this thing.