I Chronicles 26:9 Midrash

וְלִמְשֶֽׁלֶמְיָ֗הוּ בָּנִ֧ים וְאַחִ֛ים בְּנֵי־חָ֖יִל שְׁמוֹנָ֥ה עָשָֽׂר׃ (ס)

And Meshelemiah had sons and brethren, valiant men, eighteen.

Read midrashic interpretation of I Chronicles 26:9: and classical rabbinic exegesis.