Numbers 34:16

Of the representatives now selected through Moses beforehand, who were all princes, i. e. heads of chief families, in their respective tribes (see Numbers 13:2), Caleb alone, of the tribe of Judah, is otherwise known to us (see Numbers 13:4 ff). The order in which the tribes are named is peculiar to this passage. If they be taken in pairs, Judah and Simeon, Benjamin and Dan, Manasseh and Ephraim, Zebulun and Issachar, Asher and Naphtali, the order of the pairs agrees with the order in which the allotments in the Holy land, taken also in couples, followed each other in the map from south to north.