How in the world could the Lord possible say to Moses that he (Moses) did not believe Him (the Lord) in Numbers 20:12 (NKJV)? For 40 years Moses led the Lord’s people through the wilderness toward the promised land; for 40 years Moses taught the people the Lord’s way; for 40 years Moses prayed and sought guidance from the Lord—how could the Lord say that?
That Moses did believe and trust in the Lord is obvious to any reader of Scripture, but it must have been the case that in Moses’ frustration with the rebellious people of Israel, in his weakness, he exhibited a degree of rebellion (unbelief) himself. It has been suggested elsewhere that Moses was unsatisfied with the Lord’s remedy of the situation, and he expressed it in his actions before the people.
Whether this is the case or not, one thing that can be learned is this: to him whom much is given much is expected. Moses was given much, very much. The Lord expected better of him, and Moses failed Him on this occasion. How much have you been given?