We just mentioned the pasuk: גם הנה העץ אשר עשה המן למרדכי אשר דבר טוב על המלך - “Behold, there is also the gallows, which Haman made for Mordechai who spoke good for the King.” When did Mordechai ever “speak good” for King Achashveirosh?
Haman’s advisors told him to make a gallows and get the King’s consent to hang Mordechai. Immediately, he hired one of the best carpenters in Shushan Habirah and instructed him to build a 50-cubit-high pole. The carpenter was not aware of its purpose, but, knowing Haman’s wealth, he made it of the most expensive wood and adorned it with gold.
Upon completion, he handed Haman a hefty bill. Somewhat surprised, he said to the carpenter, “Who ever heard of paying such a huge amount for a 50-cubit pole?” The carpenter replied, “Why don’t you look at what I did, and then you will agree that my fee is reasonable.” When Haman saw the golden pole, he became enraged and shouted, “I wanted this to serve as a gallows for Mordechai; the one you made is tov al hamelech - good for the King!”
Upon hearing from Charvonah that Haman said the gallows “is good for the King,” Achashveirosh immediately bellowed, “hang him on it!” (R’ Moshe Bogomilsky b’shem R’ Shmuel Tzvi Fuchs)
