Esther 5:8, 14

if I have found favor in the sight of the king, and if it pleases the king to grant my petition and do what I request, may the king and Haman come to the banquet which I will prepare for them, and tomorrow I will do as the king says.”

Then Zeresh his wife and all his friends said to him, “Have a gallows fifty cubits high made and in the morning ask the king to have Mordecai hanged on it; then go joyfully with the king to the banquet.” And the advice pleased Haman, so he had the gallows made.