'Descendants' in the Bible

This was John's testimony when the Jewish leaders sent priests and descendants of Levi to him from Jerusalem to ask him, "Who are you?"

They replied to him, "We are Abraham's descendants and have never been slaves to anybody. So how can you say, "You will be set free'?"

"I know that you are Abraham's descendants. Yet you are trying to kill me because you've not received what I've told you.