Numbers 20:12

And the Lord spake unto Moses and Aaron, Because ye believed Me not, because they had not firmly, unconditionally, and confidently placed their humble trust in His word, to sanctify Me in the eyes of the children of Israel, to give evidence before the eyes of the children of Israel that He was the Holy One, therefore ye shall not bring this congregation into the land which I have given them. Neither of them would have this privilege, since by their fleshly zeal and disgust they had distorted and obscured before the eyes of the people the image of Jehovah Himself; neither of them would enter the Land of Promise. The occasional discontent which manifests itself in the lives of Christians, though usually a sin of weakness, is highly displeasing in the sight of the Lord, and often brings some evidence of His displeasure upon the offenders.