'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;

and there rose up certain of those of the sect of the Pharisees who believed, saying -- 'It behoveth to circumcise them, to command them also to keep the law of Moses.'

and they are instructed concerning thee, that apostasy from Moses thou dost teach to all Jews among the nations, saying -- Not to circumcise the children, nor after the customs to walk;