Midrasz do Nahuma 2:5

R. Shimon b. Yochai says (Psalms 16:11) "sated (sova) with joys in Your presence": Rend it not "sova," but "sheva" (seven). To seven "joys" the faces of the righteous are likened in time to come: the sun, the moon, the firmament, the stars, lightnings, lilies, the menorah of the Temple: the sun and the moon — (Song of Songs 6:10) "beauteous as the moon, clear as the sun." the firmament and the stars — (Daniel 12:3) "The wise will shine like the radiance of the firmament, and the turners of the many to righteousness, like the stars, forever and ever." lightnings — (Nachum 2:5) "and they flash like lightning." lillies (Psalms 45:1) "For the chief musician, on the lillies." the menorah of the Temple — (Hoshea 14:7) "and his glory will be like the olive tree." And (Zechariah 4:3) "There are two olive trees over it (the Temple menorah), one at the right of the bowl and one at the left."

Rabbi Yehuda interpreted the verse regarding Torah scholars: “Curls, black as a raven” – these are Torah scholars, as even though they appear ugly and black in this world, in the future, “their appearance is like torches, they dash like lightning” (Nahum 2:5).
Rabbi Shmuel bar Yitzḥak interpreted the verse regarding the portions of the Torah: “Curls, black as a raven” – these are the texts of the Torah that appear too ugly and black to state them in public, and the Holy One blessed be He said: They are pleasant for Me, just as it says: “The offering of Judah [and Jerusalem] will be pleasant” (Malachi 3:4). Know that it is so, as the portion of the zav and the zava were not stated together; rather, this one in and of itself and that one in and of itself, as it is stated: “Speak to the children of Israel, and say to them: Any man, when he has a discharge from his flesh” (Leviticus 15:2), [and separately,] “And a woman, if her bloody discharge shall flow” (Leviticus 15:25).

Another interpretation of, "And you shall take for yourselves" (Leviticus 23:40): This is [the understanding of] that which is written (Psalms 16:11), "You will inform me the path of life, complete joy." David said in front of the Holy One, blessed be He, "Teach me through which gate it is straight to life in the world to come." Rabbi Yudan said, "The Holy One, blessed be He, said to David, 'If you need life, you need afflictions, as it is written, "And the path of life is the rebuke that disciplines."'" "Complete joy (literally, satiation of joys)" - He has satiated us with five joys: Scripture, Mishna, Mishnah, Talmud, Tosefta, and aggadot. Another interpretation of "complete (sova) joy" (Psalms 16:11) - these are the seven (sheva) groups of the righteous that will greet the face of the Divine Presence in the future. And their faces are similar to the sun, the moon, the firmament, the stars, lightning, lilies and the pure menorah that was in the Temple. From where [do we know] the sun? Since it is stated (Song of Songs 6:10), "radiant as the sun." From where [do we know] the moon? Since it is stated (Song of Songs 6:10), "beautiful as the moon." From where [do we know] the firmament? Since it is stated (Daniel 12:3), "And the knowledgeable will be radiant like the bright firmament." From where [do we know] the stars? Since it is stated (Daniel 12:3), "and those who lead the many to righteousness will be like the stars forever and ever." From where [do we know] lightning? Since it is stated (Nahum 2:5), "they appear like torches, they race like lightning." From where [do we know] lilies? Since it is stated (Psalms 45:11), "For the choirmaster; upon lilies." From where [do we know] the pure menorah? Since it is stated (Zechariah 4:2), "He said to me, 'What do you see?' And I said, 'I see a menorah all of gold.'" "Pleasant things are ever in Your right hand" (Psalms 16:11). And who will inform us which group are the most beloved and pleasant among them? Two Amoraiam (scholars of the Talmudic period) [differed about this]. One said, "That is [the one] that comes with the power of Torah and the power of [the] commandments." And the other said, "Those are the scribes and the teachers of Mishnah who teach infants truthfully and will stand in the future in the right hand of the Holy One, blessed be He." This is [the understanding of] that which is written, 'Pleasant things are ever in Your right hand.'" Another interpretation of "Complete (sova) joy" (Psalms 16:11) - these are the seven (sheva) commandments of the festival, and these are them: The four species that are in the lulav, the sukkah (hut), the festival offering and the offering of joy. If there is an offering of joy, why is there a festival offering; and if there is a festival offering, why is there an offering of joy? Rabbi Avin said, "[There is a relevant] parable about two that went into a judge and we do not know who was victorious. Rather we know that the one that [comes out] carrying a palm branch is the winner. So [too] Israel and the nations of the world come and prosecute [each other] before the Holy One, blessed be He, on Rosh Hashanah and we do not know who won. Rather when we see that Israel is coming out from in front of the Holy One, blessed be He, with their lulavs and citrons in their hands, we know that Israel are the winners (and that creates a need to offer an offering of joy, as well as the holiday offering). Hence, Moshe warns Israel and says to them (Leviticus 23:40), 'And you shall take for yourselves.'"