Exodus 12:11 Now you shall eat it in this manner: with your loins girded, your sandals on your feet, and your staff in your hand; and you shall eat it in haste-- it is the LORD'S Passover.

Exodus 12:48 "But if a stranger sojourns with you, and celebrates the Passover to the LORD, let all his males be circumcised, and then let him come near to celebrate it; and he shall be like a native of the land. But no uncircumcised person may eat of it.

Numbers 9:14 'If an alien sojourns among you and observes the Passover to the LORD, according to the statute of the Passover and according to its ordinance, so he shall do; you shall have one statute, both for the alien and for the native of the land.'" (NASB ©1995)