From the Bible.

'You shall not give any of your offspring to offer them to Molech, nor shall you profane the name of your God; I am the LORD.Leviticus 18:21

Then it came about in the morning that Balak took Balaam and brought him up to the high places of Baal, and he saw from there a portion of the people. Numbers 22:41

Then they made their sons and their daughters pass through the fire, and practiced divination and enchantments, and sold themselves to do evil in the sight of the LORD, provoking Him. 2 Kings 17:17

They even sacrificed their sons and their daughters to the demons, Psalms

"And shed innocent blood, The blood of their sons and their daughters, Whom they sacrificed to the idols of Canaan; And the land was polluted with the blood. Ps.106:38

"They have built the high places of Topheth, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire, which I did not command, and it did not come into My mind. Jeremiah 7:31

"They built the high places of Baal that are in the valley of Ben-hinnom to cause their sons and their daughters to pass through the fire to Molech, which I had not commanded them nor had it entered My mind that they should do this abomination, to cause Judah to sin. Jeremiah 32:35

"You slaughtered My children and offered them up to idols by causing them to pass through the fire. Ezekiel 16:21

"Thus says the Lord GOD, "Because your lewdness was poured out and your nakedness uncovered through your harlotries with your lovers and with all your detestable idols, and because of the blood of your sons which you gave to idols,

Ezekiel 16:36