If you are a leader in any occupation or activity you surely understand what it is like to be frustrated with people you work alongside. Those that work alongside may actually work for you, and sometimes the frustration is made worse.
Moses was a man who had no one work for him, though there were many who worked alongside him. Though no one worked for him, his position in the nation of Israel was without parallel; not even Aaron, the High Priest, was of the status of Moses. The position of these two men within the nation was significant to the people and certainly to the Lord.
As the nation of Israel was approaching the cusp of the land of promise, there was a complaint. Some within that nation complained by blaming Moses and Aaron for not taking them into the promised land in order for them to die in the wilderness (Numbers 20:4-5). Moses had been through this before, but his frustration level reached a peak on this occasion (20:8-11).
The Lord was disappointed in the actions of his two servants, and His response to His two servants was that they did not believe Him in order to sanctify Him before the eyes of the nation. Did not believe Him? I can hardly imagine!
It brings us to a point of application. There is not a single one of us who has not been frustrated greatly by one of the brethren. If Moses was, then who are we to not be? Moses’ response is one with which we can relate very well, but the Lord said we had better not. That’s our application.