Midrash su Deuteronomio 1:4

Another matter, “the words of Kohelet, son of David” – three prophets, because their prophecies were matters of rebuke, their prophecy is attributed to them. These are: “The words of Kohelet”; “the words of Amos” (Amos 1:1); “the words of Jeremiah” (Jeremiah 1:1).⁴This stands in contrast to, for example, the beginning of the book of Joel, which states: “The word of the Lord that came to Joel son of Petuel.” God does not attach His name to negative matters.
Why was his name called Jeremiah? It is because in his days, Jerusalem became desolate [irmeia]. Amos, why was his name called Amos? Rabbi Pinḥas said: It is because his tongue was encumbered [amus]. The people of his generation said: The Holy One blessed be He overlooked all His creations and rested His Divine Presence only on this stutterer with a severed tongue? Kohelet, why was his name called Kohelet? It is because his words were stated in an assembly [hak’hel], as it says: “Then Solomon assembled” (I Kings 8:1). Rabbi Aḥa in the name of Rav Huna: One group would enter as another group was exiting, to hear Solomon’s wisdom. That is what the queen of Sheba said to him: “Happy are your people, happy are these servants of yours” (I Kings 10:8), and it is written: “There came from all the peoples to hear Solomon’s wisdom” (I Kings 5:14).
He was called by three names: Yedidya, Kohelet, Solomon. Rabbi Yehoshua says seven: Agur, Yakeh, Lemuel, Itiel.⁵In addition to Yedidya, Kohelet, and Solomon. Shmuel said: The most primary and authentic among them are Yedidya, Kohelet, Solomon. Rabbi Shmuel concedes regarding these [other] four, but they were epithets given to Solomon, and they were given to be expounded: Agur, as he was filled [agur] with matters of Torah. Yakeh, as he would expel [heki] his words, like this basin that at times is full and at times is emptied; so, Solomon, at times he studied Torah and at times he would forget it.⁶This was when his heart strayed from following God. Lemuel, as he spoke [nam] to God [El] in his heart and said: I can increase⁷Horses, wives, and money, see Deuteronomy 17:16–17. and not sin. Itiel, as he said: God is with me [iti El] and I am able.⁸To marry numerous women.
“Son of David” – king, son of a king, wise man, son of a wise man, a righteous man, son of a righteous man, a nobleman, son of a nobleman.
Rabbi Yudan in the name of Rabbi Alexandri: This ox, until its tendons are cut, it can be suspended by even one tendon. Once its tendons are cut, numerous ropes and numerous nails are needed to suspend it. So too, until Solomon sinned, he would depend on his own merit, but once he sinned, he was dependent on the merit of his fathers; that is what is written: “[However, I will not tear away the entire kingdom; I will give one tribe to your son] for the sake of David, My servant” (I Kings 11:13). Rabbi Shimon ben Yoḥai taught: Happy is one who was privileged to reign in a place of royalty. There it is written: “[Og, king of Bashan,] who dwelled in Ashtarot in Edre’i” (Deuteronomy 1:4), but here, “king in Jerusalem,” in a place of royalty.

(Devarim 1:4) "after he had smitten Sichon, king of the Emori": An analogy: A king and his army have sortied into the desert. The king to his soldiers: When we come to an (inhabited) land, I will give you amnonoth (types of delicacies): His soldiers: "Give us amnonoth here." And he gave them. "Give us hot gluskaoth." And he gave them. The commander: "Because the king is wealthy and merciful, you belabor him? In the beginning I said nothing to you, so that you would not say that the king is unable to supply your needs, but now I tell you — Why do you have no faith in him!"

(Deut. 2:3:) YOU HAVE HAD ENOUGH OF GOING ABOUT THIS HILL COUNTRY. This text is related (to Cant. 2:7=3:5): I ADJURE YOU, O DAUGHTERS OF JERUSALEM BY GAZELLES <OR BY HINDS OF THE FIELD>. There are there three oaths⁹Actually there are four oaths, 2:7; 3:5; 5:8; and 8:4, and only the first two mention gazelles or hinds. in the book of Canticles.¹⁰Tanh., Deut. 1:4; cf. below 3a; Ket. 111a. Why? One in which the Holy One adjured Israel not to reveal the end¹¹Cf. Cant. R. 12:9:1.; <a second> that they would not force the end; <a third> that they would not rebel against the empires. The Holy One said to them: If you fulfill the oaths, fine; but if not, I will permit your flesh <to be a prey>, as with gazelles or hinds of the field, which no one claims or desires. Shall I not so claim your blood?