Esther 5:8, 14

If I have found favor in the sight of the king, and if it please the king to grant my wish and fulfill my request, let the king and Haman come to the feast that I will prepare for them, and tomorrow I will do as the king has said.”

Then his wife Zeresh and all his friends said to him, “Let a gallows fifty cubits high be made, and in the morning tell the king to have Mordecai hanged upon it. Then go joyfully with the king to the feast.” This idea pleased Haman, and he had the gallows made.