Deuteronomy 2:14-16

14And the time we took to come from Kadesh Barnea until we crossed over the Valley of the Zered was thirty-eight years, until all the generation of the men of war was consumed from the midst of the camp, just as the Lord had sworn to them.

15For indeed the hand of the Lord was against them, to destroy them from the midst of the camp until they were consumed.

16“So it was, when all the men of war had finally perished from among the people,