Esther 2:19-23

And when the virgins were gathered together the second time, then Mordecai sat in the king's gate. Esther had not yet shewed her kindred nor her people; as Mordecai had charged her: for Esther did the commandment of Mordecai, like as when she was brought up with him. 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. And the thing was known to Mordecai, who told it unto Esther the queen; and Esther certified the king thereof in Mordecai's name. 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.