Midrash su Salmi 18:1

A shigayyon of David. (Psalm 7:1) — This is what the verse (Ecclesiastes 10:20) says: Even among those you know, do not curse the king... Don't curse a king in your generation, and don't curse a wealthy man in your generation. ...for the bird of heaven will bring the voice... Said Rabbi Yirmiyah: "This is the raven and the knowledge of augury." ...and the winged one will tell the matter. on account of that the walls have ears. The Holy Blessed One said to David, "Why are you cursing My annointed one?" All my enemies will be ashamed and terrified (Psalm 6:11). Who are your enemies? Is it not Saul? As you said on the day the LORD saved him from the hand of... Saul (Psalm 18:1)" He said before him, "Master of the universe, do not hold mistakes [shegagot] against me like brazen deeds! (Psalm 19:13) "Mistakes [shegiy'ot] who can understand?

Another opinion. “The words of this song…” (Shmuel II 22:1) R’ Simon said: not all who say song say it. Rather, anyone for whom a miracle is done that then recites a song it is known that all their sins are forgiven and they become a new creation. Israel - when a miracle was done for them and they recited a song, all of their sins were forgiven, as it says “Then Moses caused Israel to set out…” (Shemot 15:22) He caused them to move on from their sins, “…from the Red Sea…” as it says “…they rebelled at the sea, at the Sea of Reeds.” (Psalms 106:7) So to you find in the days of Devorah and Barak – a miracle was done for them and they recited a song, as it says “On that day Deborah and Barak son of Abinoam sang…” (Shoftim 5:1) And from where do we learn that their sins were forgiven? Right after her song it says “Then the Israelites did what was offensive to the LORD…” (Shoftim 6:1) R’ Abahu said in the name of R’ Aba: everywhere else it is written ‘And the children of Israel continued to do evil…’ but after the song of Devorah it sis written ‘Then the Israelites did…’ which implies the beginning of an act. What happened to their earlier actions? It must be that the Holy One forgave them at the moment they recited a song. So too you find with David, that a miracle was done for him and he recited a song. And from where do we know that his sins were forgiven? Because it is written after his song “These are the last words of David…” (Shmuel II 23:1) And these are the first?! Rather it comes to teach us that the Holy One forgave him for the past.

“Even in your thought do not curse a king, and in your bedrooms do not curse the wealthy, as a bird of the heavens will carry the sound, and a winged one will tell the matter” (Ecclesiastes 10:20).
“Even in your thought do not curse a king” – Rabbi Yehuda ben Rabbi Simon said: The Holy One blessed be He says to a person: Because I have given you intellect beyond that of the animal, the beast, and the birds, you curse and blaspheme before me? I gave you eyes and [the animal] eyes, you have ears and it has ears, you have hands and it has hands, you have feet and it has feet, you have a mouth and it has a mouth, he is like the beasts that perish [nidma].⁸⁶This is an adaptation in the singular of Psalms 49:21. The verse compares people to beasts, but the midrash reads it as implying a difference between people and animals, that animals cannot speak. Nidma means nothing other than silence; I have silenced it before you.⁸⁷Unlike people, animals cannot speak. See the honor that I have afforded you. But you do not understand all this goodness, “man does not understand the honor” (Psalms 49:21).
Another matter: “Even in your thought do not curse a king” that is in your generation, “and in your bedrooms do not curse the wealthy” – do not curse the wealthy of your generation. “As a bird of the heavens” – Rabbi Yirmeya ben Elazar said: This is the raven, by means of bird divination.⁸⁸The king or wealthy people might find out what you said from the ravens, by means of bird divination. “And a winged one will tell the matter” – because the wall has ears.
Another matter: “Even in your thought do not curse a king” – the King of the world; “and in your bedrooms do not curse the wealthy” – the wealthy One of the world. “As a bird of the heavens will carry the sound” – Rabbi Yehoshua of Sikhnin [said] in the name of Rabbi Levi: There are some sounds that are for good and there are some sounds that are for evil. [There are] sounds for good, as it is stated: “The Lord heard the sound of your words…they have done well in everything that they spoke” (Deuteronomy 5:24). Ḥiyya bar Ada and bar Kappara: Ḥiyya bar Abba said: For good [hatava], as in the preparation of [hatavat] the incense. Bar Kappara said: For good, as in the cleaning of [hatavat] the lamps. [There are] sounds for evil, as it is stated: “The Lord heard the sound of your words, and He was enraged and took an oath…” (Deuteronomy 1:34).
Rabbi Abbahu [said] in the name of Rabbi Taḥalifa his father in law: It is written: “As I took an oath in My wrath” (Psalms 95:11) – the Holy One blessed be He said: I took an oath in My wrath, but then I recanted; “that they⁸⁹The generation of the wilderness, which left Egypt. will not enter My place of rest” (Psalms 95:11) – they will not enter this resting place,⁹⁰The Land of Israel but they will enter another resting place.⁹¹The World to Come Rabbi Beivai said in the name of Rabbi Yehoshua ben Levi: [This is analogous] to a king who was angry at his son and expelled him from his palace and took an oath that he would not allow his son to enter the palace. What did he do [once he reconsidered]? It was [already] built; he dismantled it and rebuilt it, and brought his son into it. He thereby brings his son in and [still] fulfills his vow. So too, the Holy One blessed be He said: I took an oath in My wrath and recanted. They will not enter this resting place, but they will enter another resting place.
“And a winged one will tell the matter” – Rabbi Bon said: When a person sleeps, the body tells the soul [what it has done], the soul [tells it] to the spirit, the spirit to the angel, the angel to the cherub, and the cherub to the winged one. Who is that? It is the seraph. The seraph will bring the matter and tell it before He who spoke and the world came into being.
Another matter: “Even in your thought do not curse a king” – do not curse a king who is before you. “And in your bedrooms do not curse the wealthy” – a prominent person in your locale. “As a bird of the heavens will carry the sound” – the Holy One blessed be He said to David: Would you not say: “All my enemies shall be ashamed and frightened” (Psalms 6:11)? Who were your enemies? Was it not Saul? Would you not say: “On the day that the Lord rescued him from the hand of all his enemies and from the hand of Saul” (Psalms 18:1)?⁹²Thus, you cursed the king I appointed over Israel. David said: Master of the universe: Do You calculate them for me as intentional transgressions? Consider them as unwitting transgressions [shegagot] for me. That is what is written: “A meditation [shigayon] by David, a song that he sang to the Lord concerning the words of Kush the Benjamite (Psalms 7:1).⁹³Kush the Benjamite is a reference to Saul (see Moed Katan 16b).
Another matter: “Even in your thought do not curse a king” – this is Moses, as it is stated: “There was a king in Yeshurun” (Deuteronomy 33:5). “And in your bedrooms do not curse the wealth” – this is Moses. From where did Moses become wealthy? It was from the residue of the tablets. Rabbi Ḥanin said: He discovered a quarry of sapphires in his tent, and from that Moses became wealthy, as it is stated: “Carve for you two tablets of stone…” (Exodus 34:1), its carvings will be for you.