Exodus 12:26 - 12:27
26 And it will be when your children say to you, ‘What is the meaning of this new slavery to you?’ 27 that you shall say, ‘It is a Passover sacrifice to Yahweh who passed over the houses of the sons of Israel in Egypt when He smote the Egyptians, but delivered our homes.’” And the people bowed low and worshiped.
Exodus 12:43
The Statute of the Passover
43 And Yahweh said to Moses and Aaron, “This is the statute of the Passover: no foreigner shall eat of it;
Exodus 12:48
48 But if a sojourner sojourns with you and celebrates the Passover to Yahweh, 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.