Ya'aqob Abinu, 'a"h, (Jacob) says to G-d, "Hasileni Na Miyad Ahi" (please save me from the hand of my brother, from the hand of Esau). The acronym (first letter of each) of the first three words forms the name Haman. (Haman was a descendent of Esau).
This hints to us that Ya'aqob Abinu prayed to be saved from the affliction of Haman. The Gurei HaAri say that Mordechai's soul had a spark of Ya'aqob Abinu. It was, of course, Mordechai who was behind the reversal of Haman's wicked intentions against the Jewish people.
The Hida tells us that the Gematria of the the last letters of each of the three words is 15. This hints at the fifteen years that the three Patriarchs (Aboth) studied Torah together. The fact that the three Patriarchs studied together helps the world exist. In addition, it is a hint, that in this merit, Ya'aqob Abinu would be saved from the hands of the wicked Esau.
(See Nahal Qedumim)
