Deuteronomy 24:14-15

24:14 You must not oppress a lowly and poor servant, whether one from among your fellow Israelites or from the resident foreigners who are living in your land and villages. 24:15 You must pay his wage that very day before the sun sets, for he is poor and his life depends on it. Otherwise he will cry out to the Lord against you, and you will be guilty of sin.