Reference for I Chronicles 25:21

לְאַרְבָּעָ֤ה עָשָׂר֙ מַתִּתְיָ֔הוּ בָּנָ֥יו וְאֶחָ֖יו שְׁנֵ֥ים עָשָֽׂר׃

For the fourteenth, Mattithiah, his sons and his brethren, twelve;

BDB