So they hanged Haman on the gallows that he had prepared for Mordecai. Then was the king's wrath pacified.

Jamieson-Fausset-Brown Bible Commentary

10. So they hanged Haman on the gallows that he had prepared for Mordecai-He has not been the only plotter of mischief whose feet have been taken in the net which they hid (Ps 9:15). But never was condemnation more just, and retribution more merited, than the execution of that gigantic criminal.

Matthew Henry's Concise Commentary

7:7-10 The king was angry: those that do things with self-will, reflect upon them afterward with self-reproach. When angry, we should pause before we come to any resolution, and thus rule our own spirits, and show that we are governed by reason. Those that are most haughty and insolent when in power and prosperity, commonly, like Haman, are the most abject and poor-spirited when brought down. The day is coming when those that hate and persecute God's chosen ones, would gladly be beholden to them. The king returns yet more angry against Haman. Those about him were ready to put his wrath into execution. How little can proud men be sure of the interest they think they have! The enemies of God's church have often been thus taken in their own craftiness. The Lord is known by such judgments. Then was the king's wrath pacified, and not till then. And who pities Haman hanged on his own gallows? who does not rather rejoice in the Divine righteousness displayed in the destruction his own art brought upon him? Let the workers of iniquity tremble, turn to the Lord, and seek pardon through the blood of Jesus.