Exodus 12:48-49

48But 1if a 2stranger sojourns with you, and 3celebrates the Passover to the Lord, let all his males be circumcised, and then let him come near to 4celebrate it; and he shall be like a native of the land. But no uncircumcised person may eat of it. 4956The same law shall 7apply to the native as to the 8stranger who sojourns among you.”