What 'first' did the tribe of Gad choose for themselves?
Rashi, Seforno, Targum Onkelos and Targum Yonasan: They chose to take their portion of land in that of Sichon and Og, which was the beginning of the conquest of Eretz Yisrael.
What is the meaning of "Ki Sham Chelkas Mechokek Safun"? Who is "Mechokek"?
Rashi: 'Because they knew that that was where Moshe, the Mechokek (lawgiver), was destined to be buried. 1
Targum Yonasan: 'Because the land contained precious stones and jewels 2 , and they knew that that was where Moshe was destined to be buried.
Seforno: And it is due to their intention to attain this important objective - despite the fact that the Kedushah of Eiver ha'Yarden is not on a par with the Kedushah of Eretz Yisrael - that they deserve the above-mentioned B'rachos. Refer to Bamidbar 32:5:1:1*
Which he learns from the word "Chelkas" - See Peirush Yonasan and Na'ar Yonasan.
What are the connotations of "Safun"?
Rashi: It refers to the burial-place of Moshe, which is hidden from the whole of mankind. 1
Rashi: See below, 34:6.
What is "va'Yesei Roshei Am" referring to?
Rashi #1: 'The B'nei Gad went at the head of the troops'.
To whom the Torah just alluded.
Who did "Tzidkas Hashem"?
Rashi #1: B'nei Gad went at the head of the troops'. By so doing, they were true to their word. 1
Rashi #2 and Seforno: Moshe. 2
What is "Mishpatav Im Yisrael" referring to?
Targum Yonasan: 'He (Moshe) taught Hashem's people Yisrael the system of Mishpatim'.
QUESTIONS ON RASHI
Rashi writes (in one Perush) that Moshe did "Tzidkas Hashem." What was this?
Targum Yonasan: It is what was right in the Eyes of Hashem.
Seforno: He explained the Torah to Yisrael, in the land of Sichon and Og. See Devarim, 1:5.