Isaiah speaks of the ruins of Jerusalem as if they were a person that could rejoice. This represents the people of Jerusalem who were defeated. AT: "you people who live among the ruins of Jerusalem" (See: [[rc://en/ta/man/translate/figs-personification]])
# he has redeemed Jerusalem
Here "Jerusalem" represents the people. AT: "he has redeemed the people of Jerusalem" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# bared his holy arm
Here "arm" represents Yahweh's power. Yahweh showing all the people of the nations that he is holy and powerful is spoken of as if Yahweh were a warrior who removed his cloak, baring his arms for battle. AT: "showed his holiness and mighty power" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-metaphor]])