What is "ha'Shirah ha'Zos" referring to?
Rashi #1, Ramban, Targum Onkelos and Targum Yonasan: It is referring to the Parshah of "Ha'azinu" 1 up to "Vechiper Admaso Amo" - 32:43. 2
Ha'Kesav veha'Kabalah citing Ralbag, Nedarim 38a: It refers to the entire Torah. 3
Targum Onkelos and Targum Yonasan translate "Shirah" as 'tribute'.
Refer to 31:19:151:1-4.
Refer to 31:19:151:4.
Why did Hashem say "Kisvu" in the plural?
Ramban: Because He wanted Moshe and Yehoshua to be involved in writing it, in order to establish Yehoshua as his prophet in the lifetime of Moshe. 1 The Torah nevertheless writes " ve'Lamdah es B'nei Yisrael" in the singular, because Moshe was the main teacher from whom they learned.
Torah Temimah (citing Sanhedrin, 21b): It is a Mitzvah for every person to write a Seifer Torah, 2 even if he inherited one from his fathers.
What are the implications of the phrases "ve'Lamdah Es Bnei Yisrael, Simah b'Fihem"?
Torah Temimah (citing Eruvin, 54b): It implies a. that one should teach one's Talmid as many times as necessary for him to absorb the lesson, and b. that one should do so until he has organized it clearly in his mind.
QUESTIONS ON RASHI
Rashi writes that the Torah refers to Why is 'Ha'azinu' written in the form of a Shirah. What is the reason?
Ramban: Because it is always sung and played in the form of a Shirah, and because it is written in the form of a Shirah.
Rashbam (on Pasuk 30): An arrangement of words is called 'Shirah'.
Rashi writes that "ha'Shirah ha'Zos" refers to Ha'azinu. Nedarim 38a holds that it refers to the entire Torah, and from here we learn the Mitzvah to write a Sefer Torah!
RS"R Hirsh, ha'Kesav veha'Kabalah #1: Shirah refers to Ha'azinu. Since we may not write a partial Sefer, the Mitzvah must be to write a full Sefer Torah. 1
Ha'Kesav veha'Kabalah #2: The Mitzvah is to write a Sefer Torah which contains this Shirah (Ha'azinu).
Ha'Kesav veha'Kabalah #3: Even if Shirah refers only to Ha'azinu, if the Torah obligates to write the Shirah (a warning to keep the Torah's Mitzvos), surely one must write the entire Torah (which contains the Mitzvos)!
Ha'amek Davar: Regarding Moshe [who needed to teach it to Bnei Yisrael], it refers to Ha'azinu. Regarding Yisrael, who have a Mitzvah to write it, it refers to the entire Torah.
Sefer ha'Mitzvos (Aseh 18) brings this proof. Chasam Sofer (38a)
