This is as He promised by the mouth of His holy prophets from the most ancient times [in the memory of man]–
As he spake by the mouth of his holy prophets, which have been since the world began:
(As he spake by the mouth of his holy prophets that have been from of old),
just as he said through the mouths of his holy prophets long ago.
just as he spoke by the mouth of his holy Prophets, who are from ages past:
As he spoke by the mouth of his holy prophets, who are from the beginning: