Deuteronomy 24:22 WEB

²⁰  When you beat your olive tree, you shall not go over the boughs again: it shall be for the foreigner, for the fatherless, and for the widow.

²¹  When you gather [the grapes of] your vineyard, you shall not glean it after you: it shall be for the foreigner, for the fatherless, and for the widow.

²²  You shall remember that you were a bondservant in the land of Egypt: therefore I command you to do this thing.