רוֹמְמ֣וֹת אֵ֭ל בִּגְרוֹנָ֑ם וְחֶ֖רֶב פִּֽיפִיּ֣וֹת בְּיָדָֽם׃
דערהײבונגען פֿון גאָט אין זײער קעל, און אַ צװײשאַרפֿיקע שװערד אין זײער האַנט,
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]