'Circumcise' in the Bible

And He gave to him a covenant of circumcision, and so he begat Isaac, and did circumcise him on the eighth day, and Isaac begat Jacob, and Jacob -- the twelve patriarchs;

But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.

And they are informed of thee, that thou teachest all the Jews which are among the Gentiles to forsake Moses, saying that they ought not to circumcise their children, neither to walk after the customs.