Esther 6:1-2

That night the king had trouble sleeping, so he ordered an attendant to bring the book of the history of his reign so it could be read to him. In those records he discovered an account of how Mordecai had exposed the plot of Bigthana and Teresh, two of the eunuchs who guarded the door to the king’s private quarters. They had plotted to assassinate King Xerxes.