Esther 7:9-10

And Harbonah, one of the chamberlains, said before the king, Behold also, the gallows fifty cubits high, which Haman had made for Mordecai, who had spoken good for the king, standeth in the house of Haman. Then the king said, Hang him thereon. So they hanged Haman on the gallows that he had prepared for Mordecai. Then was the king's wrath pacified.