Esth 7:9-10

9Then Harbona, one of the eunuchs in attendance on the king, said, “Look, the very gallows that Haman has prepared for Mordecai, whose word saved the king, stands at Haman's house, fifty cubits high.” And the king said, “Hang him on that.”10So they hanged Haman on the gallows that he had prepared for Mordecai. Then the anger of the king abated.