Charles Spurgeon Commentary Isaiah 57:6

"Among the smooth [stones] of the valley is thy portion; they, they are thy lot; even to them hast thou poured a drink-offering, thou hast offered an oblation. Shall I be appeased for these things?" — Isaiah 57:6 (ASV)

They had set up the smooth stones which they had found in the brook, and made them into altars—indeed, made gods of them. For when man wants to make a god, anything will do, whether it is the fetish of the cannibal or the round robin of the ritualist. It little matters which. A piece of bread will do for a god, as well as a piece of stone. Anything will man worship, sooner than worship the great, invisible, eternal God.