Exodus 12:43 - 13

43 And the Lord said to Moses and Aaron, “This is the ordinance of the Passover: No foreigner shall eat it. 44 But every man’s servant who is bought for money, when you have circumcised him, then he may eat it. 45 A sojourner and a hired servant shall not eat it. 46 In one house it shall be eaten; you shall not carry any of the flesh outside the house, nor shall you break one of its bones. 47 All the congregation of Israel shall keep it. 48 And when a stranger dwells with you and wants to keep the Passover to the Lord, let all his males be circumcised, and then let him come near and keep it; and he shall be as a native of the land. For no uncircumcised person shall eat it. 49 One law shall be for the native-born and for the stranger who dwells among you.” . . .
— EXODUS 12:43 - 13