They have built the high places of Topheth in the Valley of Ben-hinnom so they could burn their sons and daughters in the fire—something I never commanded, nor did it even enter My mind.
Jeremiah in this verse also inveighs against those superstitions by which the Jews had corrupted the true and pure worship of God. He says, that they had builded high places, which was prohibited in the law. (Leviticus 26:30.) Now God, as it has been before said, prefers obedience to all sacrifices, (1 Samuel 15:22:) hence the Prophet justly condemned them, that they forsook the Temple...
Here is, I. A loud call to weeping and mourning. Jerusalem, that had been a joyous city, the joy of the whole earth, must now take up a lamentation on high places (Jer 7:29), the high places where they had served their idols; there must they now bemoan their misery.
Commenting on Jeremiah 7:29-34
And they have built the high places of Tophet,.... Where was the idol Moloch; and which place had its name, as Jarchi thinks, from the beating of drums, that the parents of the children that were burnt might not hear the cry of them: which is in the valley of the son of Hinnom; a valley near Jerusalem, and lay to the south of it...