Exodus 12:44; Exodus 12:48

44 But every man's servant that is bought for money, when thou hast circumcised him, then shall he eat thereof.

48 And when a stranger shall sojourn with thee, 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.