Leviticus 19:9; Leviticus 19:10

9 "When you harvest your fields, do not cut the grain at the edges of the fields, and do not go back to cut the heads of grain that were left.

10 Do not go back through your vineyard to gather the grapes that were missed or to pick up the grapes that have fallen; leave them for poor people and foreigners. I am the Lord your God.