Deuteronomy 24:17-19

Do not deprive the foreigner or the fatherless of justice, or take the cloak of the widow as a pledge. Remember that you were slaves in Egypt and the LORD your God redeemed you from there. That is why I command you to do this. When you are harvesting in your field and you overlook a sheaf, do not go back to get it. Leave it for the foreigner, the fatherless and the widow, so that the LORD your God may bless you in all the work of your hands.