Deuteronomy 10:16-20

Circumcise therefore the foreskin of your heart, and be no more stiffnecked.

For the LORD your God is God of gods, and Lord of lords, a great God, a mighty, and a terrible, which regardeth not persons, nor taketh reward:

He doth execute the judgment of the fatherless and widow, and loveth the stranger, in giving him food and raiment.

Love ye therefore the stranger: for ye were strangers in the land of Egypt.

Thou shalt fear the LORD thy God; him shalt thou serve, and to him shalt thou cleave, and swear by his name.