Exodus 12:43-51 - Institution Of The Passover
43 And LORD said to Moses and Aaron, This is the ordinance of the Passover. There shall no foreigner eat of it, 44 but every man's servant who is bought for money, when thou have circumcised him, then he shall eat of it. 45 A sojourner and a hired servant shall not eat of it. 46 In one house it shall be eaten. Thou shall not carry forth any of the flesh abroad out of the house, neither shall ye break a bone of it. 47 All the congregation of Israel shall keep it. 48 And when a stranger shall sojourn with thee, and will keep the Passover to LORD, let all his males be circumcised, and then let him come near and keep it, and he shall be as one who is born in the land, but no uncircumcised man sha 49 One law shall be to him who is home-born, and to the stranger who sojourns among you.
50 Thus did all the sons of Israel, as LORD commanded Moses and Aaron, so did they. 51 And it came to pass the selfsame day, that LORD brought the sons of Israel out of the land of Egypt by their armies.