From Aesop's Fables there is a tale about an Abbot and a flea.
This is the story of the flea that was caught by the abbot. The abbot said, 'Now I've got you! You have bitten me many times, making it impossible for me to get a good night's sleep. I will never let you go; in fact, I am going to kill you right now!' The flea said, 'Holy Father, since you intend to kill me, please hold me in the palm of your hand so that I will be able to freely confess my sins to you. Let me make my confession, and then you can kill me.' The abbot was moved by the flea's piety so he placed the insect in the middle of his palm. The flea immediately leaped up into the air and flew away. The abbot yelled loudly at the flea, but the he refused to come back.
From Aesopica - Aesop's Fables in English, Latin and Greek