Joseph Benson's Commentary of the Old and New Testaments - Isaiah 57:5-6
Isaiah 57:5-6. Inflaming yourselves with idols Hebrew, הנחמים , being inflamed, or growing hot, after idols, as Dr. Waterland renders it. Lusting after them, and mad upon them, as the phrase is, Jeremiah 50:38. Fervent, both in making and in worshipping them, as was observed Isaiah 44:12. Under every green tree Wherever you see an idol erected, which was commonly done in groves, or under great and shady trees, which defended the worshippers from the heat of the sun, and were... read more
Albert Barnes' Notes on the Whole Bible - Isaiah 57:7
Upon a lofty and high mountain - The design of this verse and the following, is, to show the extent, the prevalence, the publicity, and the grossness of their idolatry. The language is that which would appropriately express adulterous intercourse, and is designed to show the abhorrence in which God held their conduct. The language is easy to be understood, and it would not be proper to go into an extended explanation of the phrases used. It is common in the Scriptures to compare idolatry among... read more