Leviticus 19:9,10
And when you reap the harvest of your land, you shall not wholly reap the corners of your field, neither shall you gather the gleanings of your harvest.
Nave's Topical Index—AKJV

Leviticus 23:22
And when you reap the harvest of your land, you shall not make clean riddance of the corners of your field when you reap, neither shall you gather any gleaning of your harvest: you shall leave them to the poor, and to the stranger: I am the LORD your God.
Nave's Topical Index—AKJV

Deuteronomy 24:19,20
When you cut down your harvest in your field, and have forgot a sheaf in the field, you shall not go again to fetch it: it shall be for the stranger, for the fatherless, and for the widow: that the LORD your God may bless you in all the work of your hands.
Nave's Topical Index—AKJV