Midrash for Numbers 26:54

(Bamidbar 26:54) "To the (more) numerous (tribe) you shall increase its inheritance, and to the less (numerous) you shall decrease its inheritance." If one had five sons when he left Egypt, and ten sons when he entered the land, I apply to them "To the numerous you shall increase its inheritance." If he had ten sons when he left Egypt, and five when he entered the land, I apply to them "and to the less you shall decrease its inheritance." "To a man": to exclude women, tumtumim, and hermaphrodites. "according to its numbers": We are hereby taught that Eretz Yisrael was apportioned to each tribe according to its (head-count). And thus is it written (Joshua 17:14-15) "And the children of Joseph said to Joshua: Why have you given me a single allotment as an inheritance, when we are a great multitude whom the L-rd had thus far blessed? And Joshua said to them: If you are a great multitude, go up to the forest country and clear an area for yourselves there in the land of the Perizzi and the Rephaim, the mountain of Ephraim constricting you." "shall his inheritance be given": I would understand this to mean (that each tribe took) indiscriminately. It is, therefore, written (55) "by allotment." If "by allotment," I would understand, by themselves (i.e., by their own lottery.) It is, therefore, written (56) "By the word (of the lottery"), whereby we are apprised that Eretz Yisrael was apportioned by the Holy Spirit. I might think, by himself (i.e., the high-priest, by means of the urim vetumim). It is, therefore, written "shall its inheritance be divided," (connoting in the presence of the entire tribe).