Genesis 17:13
He that is born in your house, and he that is bought with your money, must needs be circumcised: and my covenant shall be in your flesh for an everlasting covenant.
Torrey's Topical Textbook—AKJV

Exodus 12:48
And when a stranger shall sojourn with you, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.
Torrey's Topical Textbook—AKJV