Leviticus 19:9-10

“‘When you gather in the harvest of your land, you must not completely harvest the corner of your field, and you must not gather up the gleanings of your harvest. You must not pick your vineyard bare, and you must not gather up the fallen grapes of your vineyard. You must leave them for the poor and the resident foreigner. I am the Lord your God.’”

Leviticus 27:30

“A tithe of everything from the land, whether grain from the soil or fruit from the trees, belongs to the LORD; it is holy to the LORD.”