רוֹמְמ֣וֹת אֵ֭ל בִּגְרוֹנָ֑ם וְחֶ֖רֶב פִּֽיפִיּ֣וֹת בְּיָדָֽם׃
그 입에는 하나님의 존영이요 그 수중에는 두 날 가진 칼이로다
Likutei Moharan
And Yosef, who guarded the covenant, picked up the firstborn status, which is like the service of prayer*, which is like "double" (pi shnayim — two-mouthed) (Deut. 21:17), because prayer is two-edged. Two, since it has the praise of the Omnipresent, and asking of one’s needs. And it is like (Ps. 149): "A twoedged sword in their hand," which is like two mouths, like the idea of doubles. And he picked up [the firstborn status] from Reuben because he [Reuben] desecrated his father's bed/marital arrangements (Parashat Vayechi), because it [the firstborn status] depends on keeping the covenant.
And therefore Yosef, because he merited the aspect of prayer, which is like "for my praise will-I-restrain-[My-anger] for you," which is like the life that is drawn from the nostrils as mentioned — therefore he is called "ben PoURaT Yosef" [a charming son is Yosef], Which is like the "TaRPU" lights [i.e., 400+200+80+6+1 = 687 lights], which are seven names: `AV, SaG, MaH, BaN, QSA, QNA, QMaG, which add up to Ta"RPU [687]; the lights receive from Nukva D’fardasqa, because FaRDaSQA adds up to Ta"RPU. [See Appendices]
And therefore Yosef, because he merited the aspect of prayer, which is like "for my praise will-I-restrain-[My-anger] for you," which is like the life that is drawn from the nostrils as mentioned — therefore he is called "ben PoURaT Yosef" [a charming son is Yosef], Which is like the "TaRPU" lights [i.e., 400+200+80+6+1 = 687 lights], which are seven names: `AV, SaG, MaH, BaN, QSA, QNA, QMaG, which add up to Ta"RPU [687]; the lights receive from Nukva D’fardasqa, because FaRDaSQA adds up to Ta"RPU. [See Appendices]