Who Wrote Tehillim?

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Indeed, King David is the one who wrote the entire Book of Tehillim, as explained in the Talmud (Bava Batra 14b), and there are several explanations for why it says at the end of chapter 72, "The prayers of David son of Yishai are ended":

A. In the Talmud (Pesachim 117a), this is explained homiletically as follows: "It was taught: Rabbi Meir used to say that all the praises stated in the Book of Tehillim were said by David, as it is stated, The prayers of David son of Yishai are ended; do not read it as ended, but rather as all these.

B. Rashi (Tehillim there) explained according to the simple meaning that in this chapter all of King David's prayers came to an end, and although the chapters that follow were also his creations through divine inspiration, nevertheless this chapter was said near the end of his life, when he made Solomon king, as is apparent from the intent of the entire chapter. In this chapter he concluded his songs and prayers to Hashem, and therefore it ended with this wording, "The prayers of David son of Yishai are ended," except that later, when the arrangement of the chapters was organized, this chapter was placed at the end of the second book.

C. There is also another holy explanation from one of the great Chassidic masters in the book Maor VShemesh (Parashat Mishpatim), and this is his language: "We can explain that it is written, Blessed be Hashem, the God of Israel, from everlasting to everlasting, The prayers of David son of Yishai are ended. And the Radak explained that King David, peace be upon him, would pray for all the matters that Israel would need until the coming of our Mashiach: that the sick should be healed, that the healthy should not become ill, and that their livelihood should be blessed, and to annul all harsh decrees from them.

And in the future, when Mashiach Tzidkeinu comes speedily in our days, all judgments will be canceled and there will no longer be any need to pray for anything, because then all the good and consolations that the prophets prophesied for the House of Israel will be fulfilled among Israel. This is the meaning of the verse: Blessed be Hashem, the God of Israel, from everlasting to everlasting, meaning that in the future, when all the nations will acknowledge that He, blessed be His Name, is King over the entire world, then all judgments will be canceled and Israel will no longer need the prayers of King David, peace be upon him. This is, The prayers of David son of Yishai are ended, for then Israel will have all goodness."

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