Isaiah 2:8-9. “Their land also is full of idols: they worship the work of their own hands, that which their own fingers have made: And the mean man boweth down, and the great man humbleth himself: therefore forgive them not.”
The first two of the Ten Commandments had been broken: Thou shalt have no other gods before Me; Thou shalt not make for yourself a graven image.
When men worship what they have made with their own hands, they are really worshiping themselves. The idols they have created, be they wood, stone, gold, diamonds, whatever, are really just reflections of what is in their own hearts. Anything we love more than we love God is an idol. Idol worship is a slap in the face to the Creator of all things; it is a denial that He exists; it is to replace Him with gods that are more to the liking of their creators.
The mean (poor) and the wealthy have all humbled themselves to worship idols, and for that reason Isaiah says to God, “Don’t forgive them!” Idolatry was the greatest of Israel’s repeated national sins, and it always brought judgment down on their heads.