'Thirty eight' in the Bible

And the days in which we came from Kadesh-barnea, until we came over the brook Zered, were thirty-eight years; until all the generation of the men of war were consumed from the midst of the camp, as LORD swore to 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 porters: the sons of Shallum, the sons of Ater, the sons of Talmon, the sons of Akkub, the sons of Hatita, the sons of Shobai, a hundred thirty-eight.

And a certain man was there who was thirty-eight years in the weakness.