By both Amon and Mo'av, Hashem commanded Moshe not to attack them and relied on him to pass on the command to Yisrael. Why, by Edom, did he commmand Moshe to inform Yisrael?
Oznayim la'Torah: 'Midah k'Neged Midah'. Because, not only did Eisav desist from harming Ya'akov when they met after Ya'kov fled from Lavan, but he also orfered his four hundred men too to desist.
Why did Hashem refer to Eisav as Yisrael's brother?
Ramban: Because the lineage of Yisrael stems from Avraham, all of whose offspring are called 'brothers', since they were all circumcised. 1 That is why the Torah says "Do not hate an Edomi, since he is your brother" (23:8).
R. Bachye: Even though they are the B?nei Eisav, they are still your brothers!
Oznayim la'Torah: 'Midah k'Neged Midah', because he referred to Ya'akov as "Achi". 2
Ramban: With the exception of the sons of Avraham's concubines, Yishmael and B'nei Keturah, whom Hashem precluded when He said to Avraham (in Bereishis 21:12) "Ki be'Yitzchak Yikarei l'cha Zara". (This is difficult, since Nedarim 31a extrapollates "be'Yitzchak", 've?Lo Kol Yitzchak', to exclude Eisav as well! See Rav Chavel's footnotes).
Refer to 2:3:1511:1.
?Atem Ovrim bi?Gevul Acheihem B?nei Eisav?. What are the implications of the word ?bi?Gevul??
R. Bachye (citing Devarim Rabah): His era of greatness will come to an end, and when the time comes, all the nations of the world will turn agains him. 1
R. Bachye: As the Navi indiates in Ovadyah 1:7.
Why does the Torah insert the (otherwise superfluous) words "Acheichem B'nei Eisav ha'Yoshvim be'Se'ir"?
Rashbam: Because it was only the B'nei Eisav who lived in Se'ir who offered to sell them food and water. Those who lived in Edom responded to their request by coming out to meet them with the sword. 1
Rashbam: See Bamidbar 20, 21.
Why is there an extra 'Yud in the word "Veyir'u mikem"?
Ba'al ha'Turim: Because Eisav's fear of Yisrael was based on the ten B'rachos that Ya'akov received from Yitzchak.
What is "Ve'nishmartem Me'od" referring to?
Rashi and R. Bachye #1: It refers to waging war against Edom, as the following Pasuk explains.
R. Bachye (citing Devarim Rabah, citing R. Elazar): If, when the B?nei Eisav are frightened of us, the Torah writes "Ve'nishmartem Me'od?, how much more so when we are frightened of them!
R. Bachye (citing Devarim Rabah, citing R. Yehoshua ben Levi): ?If you want the B?nei Eisav to be afraid of you, then learn Torah, in connection with which the Torah writes - in 25:4 - ?Venishmartem Me?od le?Nafshoseichem!?
Oznayim la'Torah: When an army sees that the enemy is afraid of them, they will take the opportunity to attack them. That is why the Torah writes here that, when they see that the B'nei Eisav are afraid of them, they should take great care to control the impulse to attack them.
