God speaking by the prophets' mouths represents God causing his prophets to say what he wanted them to say. Alternate translation: "he caused his holy prophets who lived long ago to say" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The abstract noun "salvation" can be expressed with the verbs "save" or "rescue." Alternate translation: "from long ago). He will save us from our enemies" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])