Exodus 12:43-51 - Institution Of The Passover
43 And Jehovah said to Moses and Aaron, This is the ordinance of the Passover. No stranger shall eat of it. 44 But every man's servant that is bought for silver, when you have circumcised him, then he shall eat of it. 45 A foreigner and a hired servant shall not eat of it. 46 It shall be eaten in one house. You shall not carry any of the flesh out of the house. Neither shall you break a bone of it. 47 All the congregation of Israel shall keep it. 48 And when a stranger shall stay with you, and desires to keep the Passover to Jehovah, 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. And no uncircumcised person shall eat of it. 49 There shall be one law to the native, and to the visitor that stays among you.
50 So all the sons of Israel did. Even as Jehovah commanded Moses and Aaron, so they did. 51 And it happened the very same day, that Jehovah brought the sons of Israel out of the land of Egypt by their armies.