Exodus 12:48-49

MSB(i) 48 If a foreigner resides with you and wants to celebrate the LORD’s Passover, all the males in the household must be circumcised; then he may come near to celebrate it, and he shall be like a native of the land. But no uncircumcised man may eat of it. 49 The same law shall apply to both the native and the foreigner who resides among you.”