1. The sin of Jerusalem appears here very heinous, nowhere worse, or more exceedingly sinful (v. 30): "The children of Judah" (God's profession people, that came forth out of the waters of Judah, Isa. xlviii. 1) "have done evil in my sight, under my eye, in my presence; they have affronted me to my face, which very much aggravates the affront:" or, "They have done that which they know to be evil in my sight, and in the highest degree offensive to me." Idolatry was the sin which was above all other sins evil in God's sight. Now here are two things charged upon them in their idolatry, which were very provoking: (1.) That they were very impudent in it towards God and set him at defiance: They have set their abominations (their abominable idols and the altars erected to them) in the house that is called by my name, in the very courts of the temple, to pollute it (Manasseh did so, 2 Kings xxi. 7, xxiii. 12), as if they thought God would connive at it, or cared not though he was ever so much displeased with it, or as if they would reconcile heaven and hell, God and Baal. The heart is the place which God has chosen to put his name there; if sin have the innermost and uppermost place there, we pollute the temple of the Lord, and therefore he resents nothing more than setting up idols in the heart, Ezek. xiv. 4. (2.) That they were very barbarous in it towards their own children, v. 31. They have particularly built the high places of Tophet, where the image of Moloch was set up, in the valley of the son of Hinnom, adjoining to Jerusalem; and there they burnt their sons and their daughters in the fire, burnt them alive, killed them, and killed them in the most cruel manner imaginable, to honour or appease those idols that were devils and not gods. This was surely the greatest instance that ever was of the power of Satan in the children of disobedience, and of the degeneracy and corruption of the human nature. One would willingly hope that there were not many instances of such a barbarous idolatry; but it is amazing that there should be any, that men could be so perfectly void of natural affection as to do a thing so inhuman as to burn little innocent children, and their own too, that they should be so perfectly void of natural religion as to think it lawful to do this, nay, to think it acceptable. Surely it was in a way of righteous judgment, because they had changed the glory of God into the similitude of a beast, that God gave them up to such vile affections that changed them into worse than beasts. God says of this that it was what he commanded them not, neither came it into his heart, which is not meant of his not commanding them thus to worship Moloch (this he had expressly forbidden them), but he had never commanded that his worshippers should be at such an expense, nor put such a force upon their natural affection, in honouring him; it never came into his heart to have children offered to him, yet they had forsaken his service for the service of such gods as, by commanding this, showed themselves to be indeed enemies to mankind.