And they have built the high places of Tophet, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire; which I commanded them not, neither came it into my heart. Tophet - in the valley of the son of Hinnom - Tophet was the place in that valley where the continual fires were kept up, in and through which they consecrated their children to Moloch.
Related Commentaries of Jeremiah 7:31
Jeremiah 7:31
31 And they have built the high places of Tophet, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire; which I commanded them not, neither camee it into my heart.