'Thirty eight' in the Bible

Now the {length of time} that we had traveled from Kadesh Barnea until [the time when] we crossed the wadi of Zered [was] thirty-eight years, until the perishing of all of that generation; [that is], the men of war from the midst of the camp as Yahweh had sworn to them.

And the Levites thirty years old and above were counted, and their number according to their head count for the men [was] thirty-eight thousand.

The gatekeepers: the descendants of Shallum, the descendants of Ater, the descendants of Talmon, the descendants of Akkub, the descendants of Hatita, the descendants of Shobai, one hundred and thirty-eight.