I Chronicles 25:12 Midrash

הַחֲמִישִׁ֣י נְתַנְיָ֔הוּ בָּנָ֥יו וְאֶחָ֖יו שְׁנֵ֥ים עָשָֽׂר׃

The fifth to Nethaniah, his sons and his brethren, twelve;