'Circumcision' in the Bible

So he let him go: then she said, A bloody husband thou art, because of the circumcision.

But every man's servant, whom he has got for money, may take of it, when he has had circumcision.

And if a man from another country is living with you, and has a desire to keep the Passover to the Lord, let all the males of his family undergo circumcision, and then let him come near and keep it; for he will then be as one of your people; but no one without circumcision may keep it.