Luke 15: 4-7

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

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And when he has found it, he lays it on his shoulders, rejoicing.

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And when he comes home, he calls together his friends and neighbours, saying to them, ‘Rejoice with me, for I have found my sheep which was lost!’ I say to you that likewise there will be more joy in Heaven over one sinner who repents than over ninety-nine just persons who need no repentance.”