TgO Deut29:9 :רֵישֵיכוֹן שִבטֵיכוֹן סָבֵיכוֹן וְסָרְכֵיכוֹן‏ : your chiefs your tribes, your elders, and your commanders
See the entire entry for rēš, rēšā n.m. head; top; chief