John 8.3-7 (regarded by many scholars as an interpolation):
 And the scribes and Pharisees brought unto him a woman taken in adultery; and when they had set her in the midst,  They say unto him, Master, this woman was taken in adultery, in the very act.  Now Moses in the law commanded us, that such should be stoned: but what sayest thou?  This they said, tempting him, that they might have to accuse him. But Jesus stooped down, and with his finger wrote on the ground, as though he heard them not.  So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her.
Diogenes Laertius 6.62 (on Diogenes, tr. R.D. Hicks):
Seeing the child of a courtesan throw stones at a crowd, he cried out, "Take care you don't hit your father."