Esther 7:9-10

Then Harbonah, one of the eunuchs serving the king said, “Now look, there are gallows fifty cubits (75 ft.) high standing at Haman’s house, which Haman made for Mordecai, whose good warning saved the king.” And the king said, “Hang him on it.” So they hanged Haman on the gallows that he had prepared for Mordecai. Then the king’s anger subsided.