Who wrote the books of the Jewish Bible?
According to the baraita:
King David wrote Sefer gathering the writings of ten elders:
Malki-Zedek (Psalm 110)
Moshe (Psalm 90 – many say that the following 10 psalms are also written by him)
Heman (Psalm 88)
Yedutun (Psalm 39)
This list presents a number of challenges.
One question that is raised by the commentaries is what the Gemara means when it presents Moshe as writing the Torah and the chapter of Bilam’s prophecy. Isn’t it clear that Bilam’s chapter is part of the Torah?
The Ritva suggests that there is a separate book written by Moshe that described in great detail the story of Bilam and his prophecy, but that the book was lost and we do not possess it any longer. The Maharal explains that the emphasis is on the fact that Bilam’s prophecy is an intrinsic part of the Torah and that no one should think that it is unimportant since it is a “foreign” prophecy.