Deut. 4:15–19 
Hab. 2:18–20 
Matt. 15:1–9 
1 John 1:1–4 
Negatively, the 2nd commandment says you shall not make carved images. But stated positively, the core of the command is to worship God by his Word. We must be convinced that God himself tells us how to serve and worship him. He does this through his Word, not through our experiences. And the reason why he does it in order to keep us liberated from the enslaving power of idolatry.