Murmuring,  complaining, griping, criticizing, faultfinding, whining… are serious actions to God.   Colossians 3:17 (KJV) 17 And whatsoever ye do in word or deed, do all in the name of the Lord Jesus, giving thanks to God and the Father by him. Colossians 3:23 (KJV) 23 And whatsoever ye do, do it heartily, as to the Lord, and not unto men;    Philippians 2:14-15 (HCSB) 14 Do everything without grumbling and arguing, 15 so that you may be blameless and pure, children of God who are faultless in a crooked and perverted generation, among whom you shine like stars in the world.