Parashas Vayeira · Passuk 22:13
And Avraham lifted up his eyes and saw, and behold, a ram behind, caught in the thicket by its horns; and Avraham went and took the ram and offered it as a burnt-offering in place of his son.
Torah Temimah points to Yerushalmi Taanis 2:4.
TT lemma: איל אחר.
English: “A ram behind (achar).” What is “achar”? Rabbi Yuda bar Simon said: [The Holy One said to Avraham,] After all the generations your children are destined to be caught in sins and entangled in troubles, and in the end they will be redeemed by the horns of this ram, as it is said, “And the Lord God will sound the shofar.”
Derash on the verse (Yerushalmi) — not a formal named middah of the 13. The word “achar” and the ram’s horns are projected onto the eschatological shofar.
The ram of the Akeidah, caught by its horns, foreshadows the future redemption of Israel by the shofar; after the generations of entanglement, they will be redeemed by those horns.