Amos is the book of the herdsman from Tekoa, a small town in Judah. He receives a direct call from God to prophesy against the unrighteousness of both Judah and Israel. Amos is the first prophet to proclaim that God is the ruler of the whole world.

Amos 3

3:4 Will a lion roar in the forest, when he hath no prey? will a young lion cry out of his den, if he have taken nothing?