One of the eunuchs who “kept the door” in the court of Ahasuerus. With Teresh he conspired against the king’s life. Mordecai detected the conspiracy, and the culprits were hanged (Esther 2:21-23; 6:1-3).
Bigthan
Two doorkeepers of the king’s palace grew angry and plotted against him. Bigthan and Teresh “sought to lay hand on the king Ahasuerus,” but Mordecai, sitting at the king’s gate, heard of it and told Queen Esther, who told the king in Mordecai’s name (Esther 2:21-23). The matter was looked into, found true, and both men were hanged. It was written in the king’s chronicles and then forgotten. In Esther 6:2 the record is read aloud again, and that small note leads to Mordecai’s honour.
4 verses
Esther
Esther 2:21
In those days, while Mordecai sat in the king's gate, two of the king's chamberlains, Bigthan and Teresh, of those which kept the door, were wroth, and sought to lay hand on the king Ahasuerus.
Esther 2:22
And the thing was known to Mordecai, who told it unto Esther the queen; and Esther certified the king thereof in Mordecai's name.
Esther 2:23
And when inquisition was made of the matter, it was found out; therefore they were both hanged on a tree: and it was written in the book of the chronicles before the king.
Esther 6:2
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.
From Easton's Bible Dictionary
Matthew George Easton, 1897
From Smith's Bible Dictionary
William Smith, 1884
(gift of God), a eunuch (chamberlain, Authorized Version) in the court of Ahasuerus, one of those "who kept the door," and conspired with Teresh against the king’s life. (Esther 2:21) (B.C. 479.)