Exodus 12:48-52

And when a stranger shall sojourn with thee, and will 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 one that is born in the land: for no uncircumcised person shall eat thereof.

One law shall be to him that is homeborn, and unto the stranger that sojourneth among you.

Thus did all the children of Israel; as the LORD commanded Moses and Aaron, so did they.

And it came to pass the selfsame day, that the LORD did bring the children of Israel out of the land of Egypt by their armies.