Esther 5:13-14
13 But all this gives me no satisfaction as long as I see that Jew Mordecai sitting at the king’s gate.”
14 His wife Zeresh and all his friends said to him, “Have a gallows built, seventy-five feet high, and ask the king in the morning to have Mordecai hanged on it. Then go with the king to the dinner and be happy.” This suggestion delighted Haman, and he had the gallows built.