Numbers 21:4-5 And they journeyed from Mount Hor by the way of the Red Sea, to compass the land of Edomite: and the soul of the people was much discouraged because of the way. And the people spake against God, and against Moses. Wherefore have ye brought us up out of Egypt to die in this wilderness? for there is no bread, neither is there any water; and our soul loatheth this light bread.
Complaining and blaming became a way of life for Israel in the wilderness as their response to the problems of living in a sinful world. Life is hard and the way is difficult. The threat of death always looms, and there is never enough money and we are bored with, and loathe, the manna gifts we have received.
Because of Sin, our sin, death reigns, the world tempts, and the devil prowls all around us on our wilderness journey on earth on the way to the Land. This makes life difficult with the threat of death and loss ever present. Therefore, we get discouraged (translated impatient) because of the way. Impatience with the problems of the way cause us the speak against God and ask Why (wherefore). The “Why?” is not a sincere question, but it is really an accusation of God, an argument that He is not right. We are saying that God, not our sin, is the cause. This is sin, rebellion, and unbelief.
Then God sent poisonous serpents among the people, and many died. It is a serious matter to speak against God and question Him. A better response is to repent and believe the gospel, and to trust the Lord to fulfill His promise and to take care of us.