What do we learn from "Isfu Li Chasidai"?
Sanhedrin 108:1: This teaches that Dor ha'Midbar has a share in the world to come 1 .
Rashi: Hashem addresses Shamayim va'Aretz; they should gather the exiles - "Uri Tzafon u'Vo'i Seiman" (Shir ha'Shirim 4:16).
Radak: He says to the nations that Yisrael is exiled among them, to bring them to Yerushalayim - "Yuval Shai la'Shem Tzevakos Am Memushach u'Morat", "v'Hevi'u Es Kol Acheichem mi'Kol ha'Goyim Minchah la'Shem" (Yeshayah 18:7, 66:20).
Malbim: He calls to Chasidai to gather "Koresei Brisi Alei Zevach."
Unlike R. Akiva, who expounds there oppositely from another verse.
Why does it say "Koresei Brisi Alei Zevach"?
Rashi: They accepted the Torah with a Bris and Korban - "Hinei Dam ha'Bris Asher Karas Hashem