Esther 2:21; Esther 2:22

21 During the time that Mordecai held office in the palace, Bigthana and Teresh, two of the palace eunuchs who guarded the entrance to the king's rooms, became hostile to King Xerxes and plotted to assassinate him.

22 Mordecai learned about it and told Queen Esther, who then told the king what Mordecai had found out.