'Ninety nine' in the Bible

What do you think? If anyone had a hundred sheep, and one of them wandered away, would he not leave the ninety-nine [safe ones] and go to the mountains looking for the one that wandered away?

Truly I tell you, if he happens to find it, he is happier over it than over the ninety-nine that had not wandered away.

"Which one of you who has a hundred sheep, and loses one of them, would not leave the ninety-nine in a deserted place and go looking for the lost one until he finds it?

I tell you that, in the same way, there will be more joy in heaven over one sinful person who repents [i.e., changes his heart and life], than over ninety-nine persons who do not need to repent.