Charles Spurgeon Commentary Isaiah 57:7-8

"Upon a high and lofty mountain hast thou set thy bed; thither also wentest thou up to offer sacrifice. And behind the doors and the posts hast thou set up thy memorial: for thou hast uncovered [thyself] to another than me, and art gone up; thou hast enlarged thy bed, and made thee a covenant with them: thou lovedst their bed where thou sawest it." — Isaiah 57:7-8 (ASV)

Upon a lofty and high mountain hast thou set thy bed: even thither wentest thou up to offer sacrifice. Behind the doors also and the posts hast thou set up thy remembrance:

Where they ought to have put up texts of Scripture and the remembrance of God's law, they had set up memorials of their false gods everywhere. For when men become superstitious and worship falsely, they seem to be far more eager about it than those who worship the true God. They go to any lengths for it, and give themselves wholly up to their superstitions.