Isaiah 57:5

enflaming yourselves with idols under every green tree, burning with lust toward their idolatrous images in the terebinth groves, slaying the children in the valleys under the clifts of the rocks? as a sacrifice to Molech, the abomination of the Moabites. This shows that some of the people, even after the Babylonian exile, once more became addicted to idolatry and its abominations.