'Nine' in the Bible

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.

And Jesus answering said, Were not the ten cleansed? but where are the nine?