Which Tehillim to say for Purim?

Aneinu

Tehillim 22, which starts as “A Song of David,” deals with events that were destined to happen hundreds of years after King David’s time. David foresaw, with prophecy, the Babylonian/Persian exiles and the threat of Achashverosh and Haman over the Jewish people. Alshich, the commentator, says that King David dedicated a psalm to Esther because he had a hand in …

Who canonized (Psalms) Sefer Tehillim?

Aneinu

As per the Gemara found in Baba Basra 15a, the process of canonization for what we presently recognize as Tehillim (Psalms) was finalized by the esteemed assembly known as the Anshei Kneses Hagedolah, or the Great Assembly.

Who wrote Tehillim (Psalms)?

Aneinu

Although Tehillim is largely attributed to King David, many of the Tehillim were said by others, far before King David. Some Tehillim has been said by Adam, Avraham, Yaakov, Yosef, Moshe, King Solomon. Many of the chapters have their authors mentioned such as Asaf, and the Sons of Korach. More info can be found: Source