Luke 15: 1 - 10
1 Now the tax collectors and sinners were all drawing near to hear him.
2 And the Pharisees and the scribes murmured, saying, "This man receives sinners and eats with them."
3 So he told them this parable:
4 "What man of you, having a hundred sheep, if he has lost one of them, does not leave the ninety-nine in the wilderness, and go after the one which is lost, until he finds it?
5 And when he has found it, he lays it on his shoulders, rejoicing.
6 And when he comes home, he calls together his friends and his neighbors, saying to them, `Rejoice with me, for I have found my sheep which was lost.'
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.
8 "Or what woman, having ten silver coins, if she loses one coin, does not light a lamp and sweep the house and seek diligently until she finds it?
9 And when she has found it, she calls together her friends and neighbors, saying, `Rejoice with me, for I have found the coin which I had lost.'
10 Just so, I tell you, there is joy before the angels of God over one sinner who repents."

EWTN