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 6

6:8 The Lord GOD hath sworn by himself, saith the LORD the God of hosts, I abhor the excellency of Jacob, and hate his palaces: therefore will I deliver up the city with all that is therein.