Esther 7:9
“And Harbonah, one of the chamberlains, said before the king, Behold also, the gallows fifty cubits high, which Haman had made for Mordecai, who had spoken good for the king, standeth in the house of Haman. Then the king said, Hang him thereon.”
KJV
Read in Esther 7Meaning
The detail links Haman's present disgrace to his earlier plot against Mordecai. What Haman built as an instrument of private vengeance is now presented to the king as evidence against him.