Esther 7:9-10

Now Harbonah, one of the eunuchs, said to the king, “Look! The gallows, fifty cubits high, which Haman made for Mordecai, who spoke good on the king’s behalf, is standing at the house of Haman.” Then the king said, “Hang him on it!” So they hanged Haman on the gallows that he had prepared for Mordecai. Then the king’s wrath subsided.