Esther 2:18-23

18 Then the king held a great banquet for Esther. He invited all his officials and his advisers. He also declared that day a holiday in the provinces, and he handed out gifts from his royal generosity.
19 When the virgins were gathered a second time, Mordecai was sitting at the king's gate.
20 Esther still had not revealed her family background or nationality, as Mordecai had ordered her. Esther always did whatever Mordecai told her, as she did when she was a child.
21 In those days, while Mordecai was sitting at the king's gate, Bigthan and Teresh, two of the king's eunuchs who guarded the entrance, became angry and planned to kill King Xerxes.
22 But Mordecai found out about it and informed Queen Esther. Then Esther told the king, on behalf of Mordecai.
23 When the report was investigated and found to be true, the dead bodies of Bigthan and Teresh were hung on a pole. The matter was written up in the king's presence in his official record of daily events.