2 Kings 14:29

Jeroboam — It was in the reign of this Jeroboam, that Hosea began to prophesy, and he was the first that wrote his prophecies. At the same time Amos prophesied, soon after Micah, and then Isaiah in the days of Ahaz and Hezekiah. Thus God never left himself without witness, but in the darkest ages of the church, raised up some to be burning and shining lights, to their own age, by their preaching and living; and a few by their writings to reflect light upon us, on whom the ends of the world are come.