Deuteronomy 24:19-21

ECB(i) 19 When you harvest your harvest in your field, and forget an omer in the field, return not to take it: it becomes for the sojourner, for the orphan and for the widow: and Yah Veh your Elohim blesses you in all the work of your hands. 20 When you beat your olive tree, shake not after you: it becomes for the sojourner, for the orphan and for the widow. 21 When you clip the grapes of your vineyard, exploit not after you: it becomes for the sojourner, for the orphan and for the widow: