What are the connotations of "uv'Nuchoh Yomar"? When is it referring to?
Rashi (9:18): Refer to 9:18:2:1.
What does "Shuvah Hashem" mean?
Rashi (citing Menachem ben S'ruk): It means "Reside (tranquilly - Rashi), Hashem!" 1
Seforno: Moshe prayed that, even though Hashem's Shechinah moved to in front of Yisrael, in order to drive out the enemy from Eretz Kena'an, His Menuchas ha'Shechinah 2 should remain in the camp with Yisrael.
Targum Yonasan: 'Relent now Hashem (from your burning anger - Targum Yerushalmi) in Your good compassion, lead Your people Yisrael, and rest the Glory of Your Shechinah among them.'
Da'as Zekenim, Hadar Zekenim: All of the 1000's and 10,000's of Yisrael should return to their place, and not one should be missing.
What is the significance of the number "Rivevos Alfei Yisrael" mentioned in the Pasuk?
Rashi: It teaches us that the Shechinah does not rest on Yisrael, when they total less than 22,000.
Seforno: The Pasuk means 20,000 times 2,000 (40 million), 1 which it seems, Yisrael numbered.
Targum Yonasan: 'Have compassion on the tens of thousands of the house of Ya'akov and of the thousands of Yisrael. 2
Seforno: As in Tehilim, 68:18, in connection with the angels who came to Har Sinai at Matan Torah. (There were about 600,000 adult men. If there were millions of male youths below 20, why were less men counted 38 years later? There was no decree against youths! If almost all 40 million were women, we must say that most did not marry, or the average man had more than 30 wives! - PF) The Pesikta gives the number as 22,000, equivalent to the total number of Leviyim at the time.
See Na'ar Yonasan.
Rashi writes that the Shechinah does not rest on less than 22,000. If two engage in Torah, the Shechinah dwells among them (Avos 3:2)!
There is a higher level of Shechinah amidst 22,000. (PF) Derech Chayim (Avos 3:6)