1)
Why does the Torah insert the word "Eileh" exclusively by Efrayim (here) and by Dan (in Pasuk 42)?
1.
Ba'al ha'Turim: To hint at the Avodah-Zarah 1 associated with these tribes. Yerav'am ben Nevat, who descended from Efrayim, set up two calves, and one was in the portion of Dan.
2.
Riva (on Pasuk 36): Because Pesel Michah was in their portion, 2 and we find that Eileh alludes to idolatry - "Eleh Elohecha Yisrael" (Shemos 32:4).
1
Ba'al ha'Turim: Based on "Eileh Elohecha Yisrael" (Sh'mos 32:4), with which they addressed the Golden Calf.
2
I.e. Bnei Dan set up the Pesel in their portion, and Michah was from Har Efrayim (Shoftim 18:30, 17:1). (PF)
