Charles Ellicott Commentary Esther 6:2

"And it was found written, that Mordecai had told of Bigthana and Teresh, two of the king`s chamberlains, of those that kept the threshold, who had sought to lay hands on the king Ahasuerus." — Esther 6:2 (ASV)

It was found written. —See Esther 2:21-23.