I Chronicles 25:18 Midrash

עַשְׁתֵּֽי־עָשָׂ֣ר עֲזַרְאֵ֔ל בָּנָ֥יו וְאֶחָ֖יו שְׁנֵ֥ים עָשָֽׂר׃

The eleventh to Azarel, his sons and his brethren, twelve;

Read midrashic interpretation of I Chronicles 25:18: and classical rabbinic exegesis.