Numbers 34:18 - Ellicott's Commentary On The Whole Bible

And ye shall take one prince of every tribe... — In addition to Eleazar the high priest, and Joshua the commander of the army, one chief man, or prince, was to be selected out of each of the ten tribes which were interested in the division, as at the first census one out of each tribe was associated with Moses and Aaron (Numbers 1:4), and as was probably the case at the second census under Moses and Eleazar. (Comp. Numbers 27:2.) Security was thus afforded for the equity and impartiality of the allotment; the position of the territory only, and not its dimensions, being determined by lot. With the exception of Caleb, the names of the princes selected for this purpose are not mentioned elsewhere.