Esther 6:4

“All the king’s servants and the people of the king’s provinces know that for any man or woman who comes to the king to the inner court who is not summoned, he has but one law, that he be put to death, unless the king holds out to him the golden scepter so that he may live. And I have not been summoned to come to the king for these thirty days.”

Now it happened on the third day, that Esther put on her royal robes and stood in the inner court of the king’s house in front of the king’s rooms, and the king was sitting on his royal throne in the throne room, opposite the entrance to his house.

Then Zeresh his wife and all his friends said to him, “Have a gallows fifty cubits high made and in the morning say to the king that Mordecai should be hanged on it; then go gladly with the king to the feast.” And the word was good to Haman, so he had the gallows made.