When God sends someone to us with a word/message from him. We need to step up to the plate and take heed to what is spoken to us and obey it. God does not want a sacrificial offering in place of obedience or excuses.
A rebellious spirit is as the sin of witchcraft. To refuse to be obedient to his word is sin and idolatry is to put other things that are important to self, than what God has for us to do for him.
We need to be obedient, no matter what he gives us to do.
In short, to obey brings blessings, to disobey is sin.
Remember Saul and his outcome?