Musar zu Bereschit 49:18

Similarly, in the future the vengeance against Hashem’s enemies will also be executed by Serayah of the tribe of Dan. Thus when Dan arises one should be on the lookout for Israel’s redemption, as it is written, “I have awaited Your salvation, Hashem” (Bereishis 49:18). When Bilaam came before Pinchas the latter said to him, “Wicked one! How many evil tribulations have you brought upon the holy people!” Then Pinchas addressed Tzalyah, “Go ahead and execute him. But not with a holy Divine name lest his request be fulfilled in which he asked, “Let my soul die the death of the upright” (Bamidbar 23:10). Several types of gruesome deaths were executed upon him on the spot, but he did not die until Tzalyah took a sword upon which was a snake was engraved on both sides. Pinchas said to Bilaam, “Through the very defilement with which you were engaged shall you die.” Whereupon he killed him and Bilaam was judged with that defilement in the other world. Meanwhile in this world all of his bones disintegrated and his flesh and body turned into snakes, evil snakes. Even the worms that consumed his flesh were transformed into snakes and from his bones were also fashioned great snakes.

We have a tradition that in this prayer Jacob invoked a number of G–d's Holy Names. The words כי במקלי, when split into כ-י-ב-מ, are an allusion to the name מכבי which amounts to 72, or the same number as the Ineffable Name spelled as words (יוד-הי-ויו-הי) That name of G–d is derived from the respective first letters in the verse: מי כמוך בא-לים י-ה-ו-ה, Next we have the letters קלי, which are the respective first letters of the verse: לישועתך קויתי י-ה-ו-ה.