Introduction to Amos

Amos was a herdsman, and engaged in agriculture. But the same Divine Spirit influenced Isaiah and Daniel in the court, and Amos in the sheep-folds, giving to each the powers and eloquence needful for them. He assures the twelve tribes of the destruction of the neighbouring nations; and as they at that time gave themselves up to wickedness and idolatry, he reproves the Jewish nation with severity; but describes the restoration of the church by the Messiah, extending to the latter days.

-- taken from Matthew Henry's Concise Commentary