Esther 5:14

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.

Esther 6:6

6:6 So Haman came in, and the king said to him, “What should be done for the man whom the king wishes to honor?” Haman thought to himself, “Who is it that the king would want to honor more than me?”

Esther 9:12

9:12 Then the king said to Queen Esther, “In Susa the citadel the Jews have killed and destroyed five hundred men and the ten sons of Haman! What then have they done in the rest of the king’s provinces? What is your request? It shall be given to you. What other petition do you have? It shall be done.”