God hopes his people to keep their words

Deuteronomy 2:1-15
Israelite made their way around the hill country of Sier for a long time. Then the Load said to Moses "You have made your way around this hill country long enough now turn north."
Don't pass through the territory of the descendants of Esau, who is live in Sier.
Don't harass the Moabites or provoke their land. God have given Ar to the descendant of Lot as a possession.
Thirty-eight years passed from the time they left Kadesh Barnea until they crossed the Zered Valley. By then, that entire generation of fighting men has perished from the camp, as the Load has sword to them.
Why?
Israelite waited in Sier for a long time, for they rebelled the command of the Load, the Load sword them those fighting men would not enter the promised land, so 38 years waited in desert, entire of that generation was perished from the cap.
God promised gave the land to the descendants of Esau and Lot, they are the brother of Israelite.
The word of God is never changed, it is stand forever.
God keeps his word down the ages, and expects his people to keep theirs.
How?
Does I have keep my promised to the Load? Yes, I never forget what I have promised I will live for the   Load.  Walk the way that God leads me.