I kill ... I wound ... I will make mine arrows drunk with blood, and my sword shall devour flesh. Deuteronomy 32:39-42
The moral for Numbers is this: Don't whine.
The people complain about their hardship during the Exodus and God sends a fire to burn them alive. They complain about the food, so God forces them to eat quail until it comes out their noses and then sends a plague for complaining about it. They complain again, and God sends fiery serpents to bite and kill them. Then he kills 14,700 more for complaining about his killings.
But there other killings in Numbers. Ten scouts are killed for their honest report; a man is stoned to death for gathering sticks on the Sabbath; dissenters and their families are buried alive; God's hero, Phineas, impales an interfaith couple while they were having sex; and Moses commands his soldiers to kill all the Midianite males and non-virgin women, keeping all the virgins alive for themselves. Nasty stuff.
Here is a list of the killings in Numbers.
