פירוש על אסתר 5:13

[This] is meaningless to me. I do not care for all the honor that I have.

Whenever, etc. Our Rabbis said that he [Mordechai] would show him [Haman] a deed that he had sold himself [to Mordechai] as a slave because of lack of food when they were appointed—Mordechai and Haman as commanders of troops—in the same war.⁶Maseches Megillah 15a-b.