Genesis 17:14

And they said to them, “We cannot do this thing, to give our sister to one who is uncircumcised, for that would be a reproach to us.

Then Zipporah took a flint and cut off her son’s foreskin and touched his feet with it, and she said, “You are indeed a bridegroom of blood to me!”

‘Seven days you shall eat unleavened bread, but on the first day you shall remove leaven from your houses; for whoever eats anything leavened from the first day until the seventh day, that person shall be cut off from Israel.

‘Whoever shall mix any like it or whoever puts any of it on a layman shall be cut off from his people.’”

“If there is any person who will not humble himself on this same day, he shall be cut off from his people.

‘But the man who is clean and is not on a journey, and yet neglects to celebrate the Passover, that person shall then be cut off from his people, for he did not bring near the offering of Yahweh at its appointed time. That man will bear his sin.

when you brought in foreigners, uncircumcised in heart and uncircumcised in flesh, to be in My sanctuary to profane it, even My house, when you brought near My food, the fat and the blood. So they made My covenant void—this in addition to all your abominations.

“For this reason Moses has given you circumcision (not because it is from Moses, but from the fathers), and on the Sabbath you circumcise a man.

“And He gave him the covenant of circumcision; and so Abraham was the father of Isaac, and circumcised him on the eighth day; and Isaac was the father of Jacob, and Jacob of the twelve patriarchs.