Midrash su Zaccaria 14:7

[partial transl.] - [regarding II Sam. 23:1] [regarding II Sam. 23:1] "The utterance of is David the son of Ishai, and he utterance of the person who stands" on the mountains of learning, who accepted upon themselves the yoke of Torah and the yoke of mitzvot. What is your payment in front of Me? That you will be called 'the anointed of the God of Yaakov, and the sweet singer of Israel'. Happy is the person who sets themselves as an ox to the yoke, and as a donkey to the burden, and sits and meditates every day in Torah, always, immediately the Spirit of God rests on them, and the their Torah gets inside them, as it is written "Ho, everyone who thirsts, come for water" (Isaiah 55:1), and any mention of water really means Torah. How so? Explanation: a person reads Torah, prophets, writings, Mishnah, Halakhot, Agadot, and Midrash; and spends much time sitting, and little time in business, immediately the spirit of God is within that person, and His message are in that person's tongue, as it is written "The spirit of Ad-nai has spoken through me, His message is on my tongue" (II Sam 23:2). Happy is the person that plays with the words of the Torah and sits and chews on them like an animal that chews the cud on the field. ...

Rabbi Yehudah the son of Simon interpreted this reading as applying to generations: "and the earth was formless and void" (tohu vavohu), this is Adam the first, since he was made made entirely into nothing. "And void" (vavohu), this is Cain, who sought to return the world to "formlessness and void". And "darkness" (choshech), this is the generation of Enosh, on whom further [it says] "and their works were in darkness (bemach'shach)" (Isaiah 29:15) and they said "who is watching us and who will see us?". "On the face of the deep (tehom)", this is the generation of the flood, as it is said "On this day all the springs of the deep (tehom) were broken open" (Genesis 7:11). "And the spirit (ruach) of God fluttered over the face of the waters" on which it is further said "And God caused a wind (ruach) to pass over the earth" (Genesis 9:1). The Holy One, blessed be He, said: "how long shall the universe accustom itself to deep darkness? Let the light come!": "And Hashem said let there be light", this is Abraham. See! It is written "Who has raised (heʿir) up one from the east, righteousness" (Isaiah 41:2); do not read "raised up (heʿir with an ayin), but rather "illuminate" (heʾir with an alef). "And Hashem called the light 'day'", this is Jacob. "And the darkness he called night", this is Esau. "And it was evening", this is Esau. "And it was morning", this is Jacob. "And there was evening", the evening of Esau. "And there was morning", the morning of Jacob. "One day (yom echad)" as it is written "And there shall be one day (yom echad) which shall be known as the Hashem's, not day, and not night" (Zechariah 14:7). There is another issue with one day, that the Holy One, blessed be He, have him "one day", and what is this? Yom Kippur.

"And on the seventh day God finished his work" (Gen. 2:2). The Holy One, blessed be He, created seven dedications, six of them He dedicated, and one is reserved for the (future) generations. He created the first day and finished all His work and dedicated it, as it is said, "And it was evening, and it was morning, one day" (Gen. 1:5). He created the second day and finished all His work and dedicated it, as it is said, || "And it was evening, and it was morning, a second day" (Gen. 1:8); and so through the six days of creation. He created the seventh day, (but) not for work, because it is not said in connection therewith, "And it was evening and it was morning." Why? For it is reserved for the generations (to come), as it is said, "And there shall be one day which is known unto the Lord; not day, and not night" (Zech. 14:7).

Rabbi Elazar ben 'Azariah said: From this incident thou mayest learn that the rule of these four kingdoms will only last one day according to the day of the Holy One, blessed be He. Rabbi Elazar ben 'Arakh said unto him: Verily it is so, according to thy word, as it is said, "He hath made me desolate and faint all the day" (Lam. 1:13), except for two-thirds of an hour (of God). Know that it is so. Come and see, for when the sun turns to set in the west, (during) two hours its power is weakened, and it has no light, likewise whilst the evening has not yet come, the light of Israel shall arise, as it is said, "And it shall come to pass, that at evening time there shall be light" (Zech. 14:7).