'Ninety' in the Bible

What think ye? If a certain man should have a hundred sheep, and one of them be gone astray, does he not, leaving the ninety and nine on the mountains, go and seek the one that has gone astray?

And if it should come to pass that he find it, verily I say unto you, he rejoices more because of it than because of the ninety and nine not gone astray.

What man of you having a hundred sheep, and having lost one of them, does not leave the ninety and nine in the wilderness and go after that which is lost, until he find it?

I say unto you, that thus there shall be joy in heaven for one repenting sinner, more than for ninety and nine righteous who have no need of repentance.