'Threshold' in the Bible

In those days, while Mordecai was sitting in the king's gate, two of the king's chamberlains, Bigthan and Teresh, of those that kept the threshold, were wroth, and sought to lay hands on the king Ahasuerus.

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.