'Ninety' in the Bible

How think ye? if any man have a hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and go unto the mountains, and seek that which goeth astray?

And if so be that he find it, verily I say unto you, he rejoiceth over it more than over the ninety and nine which have not gone astray.

What man of you, having a hundred sheep, and having lost one of them, doth 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 even so there shall be joy in heaven over one sinner that repenteth, more than over ninety and nine righteous persons, who need no repentance.