Exodus 12:47

44 But every man's servant, whom he has got for money, may take of it, when he has had circumcision.

45 A man from a strange country living among you, and a servant working for payment, may not take part in it.

46 It is to be taken in one house; not a bit of the flesh is to be taken out of the house, and no bone of it may be broken.

48 And if a man from another country is living with you, and has a desire to keep the Passover to the Lord, let all the males of his family undergo circumcision, and then let him come near and keep it; for he will then be as one of your people; but no one without circumcision may keep it.

49 The law is the same for him who is an Israelite by birth and for the man from a strange country who is living with you.

50 So the children of Israel did as the Lord gave orders to Moses and Aaron.