Midrash su Salmi 23:1

Your navel is a moon-shaped goblet wherein mixed wine is not lacking; your belly is a pile of wheat hedged with lilies (Song of Songs 7:3).
“Your navel is a moon-shaped goblet.” “Your navel,” these are the Sanhedrin. Just as a baby, as long as it is in its mother’s womb, subsists only through its navel, so too Israel is unable to accomplish anything without their Sanhedrin. “A moon-shaped [hasahar] goblet,” this is the round chamber of admonition.²⁴This is a reference to the seat of the Sanhedrin, from which the Sanhedrin would issue rulings to Israel. The Sanhedrin would sit in a semi-circular structure (see Sanhedrin 36b). Avun bar Ḥisdai said: There are places that call and characterize the moon as sahara. “Wherein mixed wine is not lacking;” the Sanhedrin must not be any fewer than twenty-three.
Another matter, “wherein mixed wine is not lacking,” the Sanhedrin must not be lacking its most distinguished member. Another matter, “wherein mixed wine is not lacking,” the Sanhedrin must not lack the one who determines the halakha for it, like that which we learned there: “Diluted wine is two parts water and one part wine, from the wine of the Sharon” (Nidda 19a).²⁵Just as one would prepare wine for consumption by mixing in the right amount of water, the leader of the Sanhedrin would analyze all the sides of an issue and give direction as to the ruling. Alternatively, “wherein mixed wine is not lacking,” may the Butler of the world not be lacking, just as you say: “The Lord is my shepherd I shall not want” (Psalms 23:1).

(Fol. 118) Our Rabbis were taught: Before drinking the fourth cup [on Passover night] the Hallel should be finished and the great Hallel should also be recited thereafter. This is according to the opinion of R. Tarphon. Others, however, say: The Psalm (23) The Lord is my Shepherd, etc., should then be said. Whence does the great Hallel commence? R. Juda said: "From (Ib. 136) Give thanks, etc., until (Ib. 137), By the rivers of Babylon." And why is this called great Hallel? R. Jochanan said: "Because [therein is mentioned that] the Holy One, praised be He! sits in the uppermost heights of the world and thence deals out food for all of His creatures." R. Joshua b. Levi said: "To whom do the twenty-six times, For his loving kindness endureth forever [mentioned in the great Hallel] refer? It refers to the twenty-six generations existing before the Torah was given and which were maintained by His own grace." Again R. Joshua b. Levi said: "What is the meaning of the passage (Ib. 136) O give thanks unto the Lord, for He is good; i.e., Praise to God, who collects the debt of man out of the good bestowed upon him. The rich man is punished with the loss of his ox, a poor man with the loss of his sheep, an orphan with the loss of his egg, and a widow with the loss of her hen."

“My beloved is mine, and I am his, who herds among the lilies” (Song of Songs 2:16).
“My beloved is mine, and I am his,” He is God for me, and I am a nation for Him. He is God for me, “I am the Lord your God” (Exodus 20:2). I am a people and a nation for Him, as it is stated: “Pay attention to Me, My people, and listen to Me, My nation” (Isaiah 51:4). He is a father to me, and I am a son to Him. He is a father to me, “For You are our Father” (Isaiah 63:16). I am a son to Him, “My son, My firstborn, Israel” (Exodus 4:22). He is a shepherd to me, “Shepherd of Israel, listen” (Psalms 80:2). I am His flock, “you, My flock, flock of My pasture” (Ezekiel 34:31). He is my guardian, “Behold, the Guardian of Israel does not slumber and does not sleep” (Psalms 121:4). I am His vineyard, as it is stated: “For the house of Israel is the vineyard of the Lord of hosts” (Isaiah 5:7).
He is for me against those who provoke me, and I am for Him against those who anger Him. He is for me against those who provoke me, as He smote the firstborn of Egypt, as it is stated: “I will pass in the land of Egypt” (Exodus 12:12); “it was at midnight and the Lord smote every firstborn” (Exodus 12:29). I am for Him against those who anger Him, as I slaughtered the gods of Egypt, and likewise, “against all the gods of Egypt I will administer punishment” (Exodus 12:12), and I slaughtered them to Him, as it is stated: “Behold, will we slaughter the abomination of Egypt before their eyes, and they will not stone us?” (Exodus 8:22). Likewise, “they shall each take for them a lamb for each patrilineal home” (Exodus 12:3).
He said to me: ‘Let the proportion [hamazeg] not be skewed,’ as it is stated: “Your navel is a moon-shaped goblet, may it not lack mixed wine [hamazeg]” (Song of Songs 7:3). I said to Him: ‘You are my good beloved, if only Your goodness will never be lacking from me,’ just as it says: “The Lord is my Shepherd, I will not lack” (Psalms 23:1).
Rabbi Yehuda bar Rabbi Ilai said: He sang to me and I sang to Him; He lauded me and I lauded Him. He called me: “My sister, My love, My faultless dove” (Song of Songs 5:2), and I said to Him: “This is my beloved and this is my companion” (Song of Songs 5:16). He said to me: “Behold you are fair my love” (Song of Songs 4:1), and I said to Him: “Behold, you are fair, my beloved, pleasant too” (Song of Songs 1:16). He said to me: “Happy are you Israel, who is like you?” (Deuteronomy 33:29). I said to Him: “Who is like You among the powers, Lord?” (Exodus 15:11). He said to me: “Who is like Your people Israel, one nation in the land” (I Chronicles 17:21). I declare the unity of His name twice daily: “Hear Israel, the Lord is our God, the Lord is one” (Deuteronomy 6:4). When I require something, I seek it only from His hand, as it is stated: “It was during those many days, that the king of Egypt died; [the children of Israel sighed due to the bondage, and they cried out, and their plea rose to God due to the bondage.] God heard their groaning…God saw the children of Israel” (Exodus 2:23–25). When He requires something, he seeks it only from me and from my hand, as it is stated: “Speak to the entire congregation of Israel, saying: [In the tenth day of this month they shall take for themselves every man a lamb]” (Exodus 12:3). When I require something, I seek it only from His hand, as it is stated: “Pharaoh approached and the children of Israel raised [their eyes and…the Egyptians were traveling after them… the children of Israel cried out to the Lord]” (Exodus 14:10). When He requires something, He seeks it only from me, as it is stated: “Speak to the children of Israel and let them take a gift for Me” (Exodus 25:2). When I had trouble, I sought [salvation] only from Him: “The Children of Israel cried out to the Lord, as he had nine hundred iron chariots, and he oppressed the Children of Israel forcefully…” (Judges 4:3). What is forcefully? It was with cursing and blaspheming. When He required something, He sought it only from me, as it is stated: “They shall make a sanctuary for Me” (Exodus 25:8).