Deut 2:14

וְהַיָּמִ֞ים אֲשֶׁר־הָלַ֣כְנוּ מִקָּדֵ֣שׁ בַּרְנֵ֗עַ עַ֤ד אֲשֶׁר־עָבַ֨רְנוּ֙ אֶת־נַ֣חַל זֶ֔רֶד שְׁלֹשִׁ֥ים וּשְׁמֹנֶ֖ה שָׁנָ֑ה עַד־תֹּ֨ם כָּל־הַדּ֜וֹר אַנְשֵׁ֤י הַמִּלְחָמָה֙ מִקֶּ֣רֶב הַֽמַּחֲנֶ֔ה כַּאֲשֶׁ֛ר נִשְׁבַּ֥ע יְהוָ֖ה לָהֶֽם׃

The time we spent traveling from Kadesh-barnea until we crossed over the Brook of Zered was thirty-eight years, until that entire generation of fighting men had perished from the camp, as the LORD had sworn to them.