So we went past our relatives the descendants of Esau, who live in Seir, and avoided the road through the Arabah Valley that comes up from the Elath and Ezion-geber. Then as we traveled northward along the desert route through Moab, the LORD warned us, Do not bother the Moabites, the descendants of Lot, or start a war with them, I have given them Ar as their property, and I will not give you any of their Land. (New Living Translation).
This is a passage that brings revelation that many times we ignorantly fight battles that we are not supposed to fight or that God has not approved of. We may end up being casualties because, rather than fight the enemy, Satan and his hosts, we end up fighting God. Nobody has been and will ever be able to win in a fight with God.
God is Love and he has distributed this attribute in all of us through His Son Jesus Christ, who is an embodiment of the Living God.
Sometimes though, we fall for the deceit of Satan and He makes us fight battles that he has not assigned us to fight.
In this passage, there are battles that are better ignored and left to God than fought. We had better asked God to take control in particular cases than to take it upon ourselves to fight a course for vengeance or trying to teach a lesson. Indeed the spirit of vengeance is not of God as well as covetousness.
This becomes vivid here in that covetousness may lead us to desire property that God has not given to us and begin to work or fight to possess them. In other words we should not fight to possess what God has rightly given to others especially brethren and those who are not of the household of Satan.