I Chronicles 25:19 Midrash

הַשְּׁנֵ֤ים עָשָׂר֙ לַחֲשַׁבְיָ֔ה בָּנָ֥יו וְאֶחָ֖יו שְׁנֵ֥ים עָשָֽׂר׃

The twelfth to Hashabiah, his sons and his brethren, twelve;

Read midrashic interpretation of I Chronicles 25:19: and classical rabbinic exegesis.