ChristianAnswers.Net WebBible Encyclopedia
Both of these tribes hired Balaam to curse Israel (Deut. 23:4). The Ammonites were probably more of a predatory tribe, moving from place to place, while the Moabites were more settled. They inhabited the country east of the Jordan and north of Moab and the Dead Sea, from which they had expelled the Zamzummims or Zuzims (Deut. 2:20; Genesis 14:5). They are known as the Beni-ammi (Genesis 19:38), Ammi or Ammon being worshipped as their chief god.
Afterwards, they became hostile to Israel (Judg. 3:13). Jephthah waged war against them, and took “twenty cities… with a very great slaughter” (Judg. 11:33). They were again defeated by Saul (1 Sam. 11:11). David also defeated them and their allies the Syrians (2 Sam. 10:6-14), and took their chief city, Rabbah, with much spoil (2 Sam. 10:14; 12:26-31). The subsequent events of their history are noted in 2 Chr. 20:25; 26:8; Jer. 49:1; Ezek. 25:3, 6.
The national idol worshipped by this people was Molech or Milcom, at whose altar they offered human sacrifices (1 Kings 11:5, 7). The high places built for this idol by Solomon, at the instigation of his Ammonite wives, were not destroyed till the time of Josiah (2 Kings 23:13).