And there it was found recorded that Mordecai had exposed Bigthana and Teresh, two of the eunuchs who guarded the king's entrance, when they had conspired to assassinate King Xerxes.

Ezra 4:6
At the beginning of the reign of Xerxes, an accusation was lodged against the people of Judah and Jerusalem.

Esther 2:21
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, grew angry and conspired to assassinate King Xerxes.

Esther 2:22
When Mordecai learned of the plot, he reported it to Queen Esther, and she informed the king on Mordecai's behalf.

Esther 6:3
The king inquired, "What honor or dignity has been bestowed on Mordecai for this act?" "Nothing has been done for him," replied the king's attendants.

And it was found written, that Mordecai had told of Bigthana and Teresh, two of the king's chamberlains, the keepers of the door, who sought to lay hand on the king Ahasuerus.