Chemosh is the chief god worshipped by the Moabites. He is known as the god of war.
Num 21:29Woe to you, Moab! You are destroyed, O people of Chemosh! He has made his sons fugitives and his daughters captives to Sihon king of the Amorites.
Jer 48:46Woe to you, Moab! The people of Chemosh are destroyed! Your sons have been taken captive and your daughters into captivity.
The Moabite people themselves were called the people of Chemosh.
Furthermore, Jephthah referred to Chemosh as 'the god of Ammon,' which suggests that this faith spread not only among the Moabites but also to their neighbors, the Ammonites.
Judg 11:24Will you not possess what Chemosh your god gives you to possess? And whatever the Lord our God has dispossessed before us, we will possess.
Solomon married a Moabite woman who worshipped Chemosh, thus introducing the worship of Chemosh into Israel.
1 Kgs 11:7Then Solomon built a high place for Chemosh the abomination of Moab, on the mountain that is east of Jerusalem, and for Molech the abomination of the Ammonites.
The Israelites worshipped Chemosh and committed acts of human sacrifice.
2 Kgs 17:17And they made their sons and their daughters pass through the fire, and practiced divination and sorcery, and sold themselves to do evil in the sight of the Lord, provoking him to anger.
This high place was not destroyed until the time of King Josiah.
2 Kgs 23:13The king also defiled the high places that were east of Jerusalem, to the south of the Mount of Destruction, which Solomon the king of Israel had built for Ashtoreth the abomination of the Sidonians, and for Chemosh the abomination of Moab, and for Milcom the abomination of the Ammonites.
When the Moabite king Mesha faced defeat at the end of a battle with the Israelite army, he offered his firstborn son as a human sacrifice.
2 Kgs 3:26When the king of Moab saw that the battle was too fierce for him, he took with him 700 swordsmen to break through to the king of Edom, but they could not.2 Kgs 3:27