Esther 5:11-14

5:11 Haman then recounted to them his fabulous wealth, his many sons, and how the king had magnified him and exalted him over the king’s other officials and servants. 5:12 Haman said, “Furthermore, Queen Esther invited only me to accompany the king to the banquet that she prepared! And also tomorrow I am invited along with the king. 5:13 Yet all of this fails to satisfy me so long as I have to see Mordecai the Jew sitting at the king’s gate.”

5:14 Haman’s wife Zeresh and all his friends said to him, “Have a gallows seventy-five feet high built, and in the morning tell the king that Mordecai should be hanged on it. Then go with the king to the banquet contented.”

It seemed like a good idea to Haman, so he had the gallows built.