Esther 6:12 & 13
"Afterward Mordecai returned to the king's gate. But Haman rushed home, with his head covered in grief, and told Zeresh his wife and all his friends everything that had happened to him. His advisers and his wife Zeresh said to him, 'Since Mordecai, before whom your downfall has started, is of Jewish origin - you cannot stand against him - you will surely come to ruin!'" NIV translation
Haman went home upset about this turn of events. He called his wife and friends together and told them what had happened. This is the same group of people that had told him to have the gallows built to hang Mordecai. Now, they tell him that, because Mordecai is a Jew, he is doomed and cannot stand against him. It is awesome to see what God can and will do as he has used these events to get Haman's friends and family to see that He takes care of His own people.