וְעַל֙ שִׁבְטֵ֣י יִשְׂרָאֵ֔ל לָרֽאוּבֵנִ֣י נָגִ֔יד אֱלִיעֶ֖זֶר בֶּן־זִכְרִ֑י (ס) לַשִּׁ֨מְעוֹנִ֔י שְׁפַטְיָ֖הוּ בֶּֽן־מַעֲכָֽה׃ (ס)
Rashi on I Chronicles
And over the tribes of Israel We already stated the chiefs of David’s divisions, and now he tells who the leaders of the tribes of Israel were, the leader of each tribe.