What does Isaiah 1:29 mean?
Isaiah has warned his readers that destruction is coming for sinners and those living in rebellion against the Lord. They will be broken and consumed (Isaiah 1:28). When that time comes, Isaiah adds, they will be embarrassed by the pagan worship they participated in.Oak trees were relatively rare in the desert region of Israel. This lead some pagans to worship them or to worship false gods among the sacred oak groves in practices that sometimes included blatant sexual immorality. Some Israelites participated in these practices while continuing to outwardly worship the God of Israel (Isaiah 1:12–23).
They should have understood that participating in these pagan worship practices would clearly demonstrate their rebellion against God. Those who did so will have every reason to be embarrassed when God's judgment falls upon them.