'Thirty eight' in the Bible

Now the days in which we came from Kadesh-barnea, until we had come over the torrent Zered, were thirty-eight years; until the whole generation of the men of war was consumed from the midst of the camp, as Jehovah had sworn unto them.

And the Levites were numbered from thirty years old and upward; and their number, by their polls, man by man, was thirty-eight thousand.

The doorkeepers: the children of Shallum, the children of Ater, the children of Talmon, the children of Akkub, the children of Hatita, the children of Shobai, a hundred and thirty-eight.