'Ninety nine' in the Bible

What think you? If a man owns a hundred sheep, and one of them strays, will he not leave the ninety-nine on the hills, and go and search for the one that is straying?

And, if he succeeds in finding it, I tell you that he rejoices more over that one sheep than over the ninety-nine which did not stray.

"What man among you who has a hundred sheep, and has lost one of them, does not leave the ninety-nine out in the open country, and go after the lost sheep till he finds it?

So, I tell you, there will be more rejoicing in Heaven over one outcast that repents, than over ninety-nine religious men, who have no need to repent.