en_tn_condensed/luk/01/70.md

as he spoke

"just as God said"

he spoke by the mouth of his holy prophets from long ago

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)