John 8:4-7 (NIV) 4 [They] said to Jesus, "Teacher, this woman was caught in the act of adultery. 5 In the Law Moses commanded us to stone such women. Now what do you say?" 6 They were using this question as a trap, in order to have a basis for accusing him. But Jesus bent down and started to write on the ground with his finger. 7 When they kept on questioning him, he straightened up and said to them, "If any one of you is without sin, let him be the first to throw a stone at her."
The quality of mercy is not strain'd. / It droppeth as the gentle rain from heaven/ Upon the place beneath. / It is twice bless'd: It blesseth him that gives and him that takes.
William Shakespeare (1564-1616)
Draper's Book of Quotations for the Christian World.