Deuteronomy 2:14-16

1438 years had passed since we left Kadesh-Barnea. By the time we crossed the Zered valley, all the men who had been old enough to fight had now died. The Lord had said that this would happen.

15The Lord himself removed them so that they all died, one by one.

16Finally, the last one of these men died and no longer lived among the people.