This description of the Book of Amos is from Easton's Bible Dictionary.
The Book of Amos consists of three parts:
The style is peculiar in the number of the allusions made to natural objects and to agricultural occupations. Other allusions show also that Amos was a student of the law as well as a "child of nature." These phrases are peculiar to him: "Cleanness of teeth" [i.e., want of bread] (Amos 4:6); "The excellency of Jacob" (Amos 6:8; 8:7); "The high places of Isaac" (Amos 7:9); "The house of Isaac" (Amos 7:16); "He that createth the wind" (Amos 4:13). Quoted, Acts 7:42.
Amos: borne; a burden, one of the twelve minor prophets. He was a native of Tekota, the modern Tekua, a town about 12 miles south-east of Bethlehem. He was a man of humble birth, neither a "prophet nor a prophet's son," but "an herdman and a dresser of sycamore trees," R.V. He prophesied in the days of Uzziah, king of Judah, and was contemporary with Isaiah and Hosea (Amos 1:1; 7:14,15; Zechariah 14:5), who survived him a few years. Under Jeroboam II, the kingdom of Israel rose to the zenith of its prosperity; but that was followed by the prevalence of luxury and vice and idolatry. At this period Amos was called from his obscurity to remind the people of the law of God's retributive justice, and to call them to repentance.