מוסר אויף אסתר 3:2

And arrogance against the wicked is exceedingly to be praised, to rebuke them and to shame them, and he must never humble himself to them, and he must command them concerning the good and warn them, as much as lies in his power, against evil. Even though his preaching to them may seem in the eyes of the world like lording over others and boasting, since his intention is for the sake of God he is to be praised. And he should not humble himself before the wicked, following the example of Mordecai who refused to bow before Haman. And wherever he has to perform a commandment of God, let him not bow at all to the wicked to leave the good thing he intends to do, merely because he will be lower in their eyes. And this in itself requires wisdom as to when he should lord it over them in the matter of performing a good deed. For there are times when it is not worthwhile to oppose them, since if he opposes them in his attempt to perform one precept, he may lose the opportunity of persuading them to perform a hundred precepts.

To sum up: The Holy Temple will be built on the territory of Benjamin who had never bowed nor prostrated himself before Esau. Midot (2, 6) mentions thirteen occasions when one had to prostrate onself before G–d in the Holy Temple. That number corresponded to the numerical value in the word אחד, "One." When, in exile, after the destruction of the Holy Temple, Mordechai, scion of the tribe of Benjamin, refused to bow down to an alien deity, he, Esther's godfather, became the instrument through whom the Temple was rebuilt with the help of the Persian king Cyrus, a son of Esther. Although the kingdom did not remain in the hands of the tribe of Benjamin, the Holy Temple remained and will remain in that territory. In retrospect, all this was alluded to by the manner in which Samuel anointed Saul. He used only a cruse of oil; he anointed David by pouring the oil from a קרן, horn. The significance of this will be explained later.