"10 Then Jesus straightened up and said to her, “Woman, where are they? Has no one condemned you?”
11 She replied, “No one, sir.” Then Jesus said, “Neither do I condemn you. Go, [and] from now on do not sin any more.” "
"St John the Evangelist highlights one detail: while his accusers are insistently interrogating him, Jesus bends down and starts writing with his finger on the ground. St Augustine notes that this gesture portrays Christ as the divine legislator: in fact, God wrote the law with his finger on tablets of stone (cf. Commentary on John's Gospel, 33,5).
Thus Jesus is the Legislator, he is Justice in person.
And what is his sentence? "Let him who is without sin among you be the first to throw a stone at her". These words are full of the disarming power of truth that pulls down the wall of hypocrisy and opens consciences to a greater justice, that of love, in which consists the fulfilment of every precept (cf. Rom 13: 8-10).
This is the justice that also saved Saul of Tarsus, transforming him into St Paul (cf. Phil 3: 8-14)."