(Devarim 33:5) "And He was a King in Yeshurun": When Israel are of one counsel below, His great name is exalted above, viz. "And He was a King in Yeshurun" — When? "when the heads of the people gathered." And there is no "gathering" but that of the elders, as it is written (Bamidbar 11:16) "Gather unto Me seventy men from the elders of Israel."
God Is King in Yeshurun Only When the Tribes Unite
Sifrei Devarim 346:1