en_tn_condensed/isa/27/13.md

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a great ram's horn will be blown

This can be stated in active form. Alternate translation: "someone will blow a ram's horn loudly" (See: rc://en/ta/man/jit/figs-activepassive)

will come

"will return to Jerusalem"

and the outcasts in the land of Egypt

The verb "will come" is understood from the previous clause. Alternate translation: "the outcasts in the land of Egypt will come" (See: rc://en/ta/man/jit/figs-ellipsis)

holy mountain

The "holy mountain" is Mount Zion, in Jerusalem. See how you translated this in Isaiah 11:9.