Genesis 17:13

“So the bow shall be in the cloud, and I will look upon it, to remember the everlasting covenant between God and every living creature of all flesh that is on the earth.”

“And I will establish My covenant between Me and you and your seed after you throughout their generations for an everlasting covenant, to be God to you and to your seed after you.

but every man’s slave purchased with money, after you have circumcised him, then he may eat of it.

‘But if a priest buys a person as his property with his money, that one may eat of it, and those who are born in his house may eat of his food.

“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.