Deuteronomy 10:16-19

Therefore circumcise the foreskin of your heart, and be stiff-necked no longer. For the LORD your God is God of gods and Lord of lords, the great God, mighty and awesome, who shows no partiality nor takes a bribe. He administers justice for the fatherless and the widow, and loves the stranger, giving him food and clothing. Therefore love the stranger, for you were strangers in the land of Egypt.