The Parable of the Lost Coin

Luke 15:8-10

Or what woman having ten groats, if she lose one groat, doth not light a candle and sweep the house and seek diligently until she find it?

And when she hath found it, call together her friends and neighbours, saying: Rejoice with me, because I have found the groat which I had lost.

So I say to you, there shall be joy before the angels of God upon one sinner doing penance.