Mat 18:12 What do you think? If a man has a hundred sheep, and one of them has gone astray, does he not leave the ninety-nine on the mountains and go in search of the one that went astray?
Mat 18:13 And if he finds it, truly, I say to you, he rejoices over it more than over the ninety-nine that never went astray.
Luk 15:4 What man of you, having a hundred sheep, if he has lost one of them, does not leave the ninety-nine in the open country, and go after the one that is lost, until he finds it?
Luk 15:7 Just so, I tell you, there will be more joy in heaven over one sinner who repents than over ninety-nine righteous persons who need no repentance.

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