Deuteronomy 24:14-15

14“You shall not take advantage of a hired servant who is poor and needy, whether [he is] one of your countrymen or one of the strangers (resident aliens, foreigners) who is in your land inside your cities.

15You shall give him his wages on the day that he earns them before the sun sets—for he is poor and is counting on it—so that he does not cry out to the Lord against you, and it becomes a sin for you.