'Guarded' in the Bible

In those days, while Mordecai was sitting at the king’s gate, Bigthan and Teresh, two of the king’s eunuchs who guarded the door, became angry and conspired to attack King Ahasuerus.

It was found written there how Mordecai had reported that Bigthana and Teresh, two of the king’s eunuchs who were doorkeepers, had planned to attack King Ahasuerus (Xerxes).