Deuteronomy 2:14-16

14And the days in which we came from Kadesh-barnea, until we were come over the brook Zered, were thirty and eight years; until all the generation of the men of war were consumed from the midst of the camp, as Jehovah sware unto them. 15Moreover the hand of Jehovah was against them, to destroy them from the midst of the camp, until they were consumed.

16So it came to pass, when all the men of war were consumed and dead from among the people,