Amos was a herdsman and gatherer of sycamore fruit. (Small figs grew on it). He was not a prophet nor the son of a prophet (7:4), but God called him to go to the Northern Kingdom where King Jeroboam II reigned. They had become very prosperous, but also very wicked. Amos was sent to expose their sins and warn them to repent. Their worship had become empty. They were more concerned with money and pleasure than true heart worship of Jehovah.
You see the verses that say “For three transgression of —for four.” It means you have gone one to many times against the God of Israel.
As we read these books of the prophets, let us search our heart, to see if maybe we are guilty of some of these sins. Therefore, be warned, repent; turn back to the “ole paths.”