Jerome of Stridon
Thus declares the Lord God, ‘This shall be the allotment by which you will inherit the land, according to the twelve tribes. Joseph will receive a double portion; however, each of you will share equally with your brother. I raised my hand and swore to give this land to your forefathers; it shall be your inheritance. Instead of emphasizing Joseph’s double portion, the Septuagint interprets the name as a reference to a heightened inheritance, as Joseph signifies an increase. Except for the tribe of Levi, designated for the temple service, there are eleven tribes remaining.
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Among these, Joseph's tribe is divided into two: Ephraim and Manasseh, who asked Joshua the son of Nun, ‘Why have you given me only a single lot when I am numerous?’ But Joshua replied, ‘If you are indeed numerous, go up to the forest and clear a place for yourself in the land of Perizziah and Raphael, if the mountain of Ephraim is causing you difficulty (Hab. 17:13-14).’ Furthermore, Joshua said to the house of Ephraim and Manasseh, ‘You are many, and your strength is considerable: you will not be allotted just one portion, but you shall ascend the mountains, clear a space for yourself, and dwell further, when you have defeated the Canaanites, of whom you claim they have iron chariots and are very strong.’ This clarification is necessary because the Scripture refers to Joseph receiving a double portion, namely, Ephraim and Manasseh. In contrast, the other tribes receive their land proportionately, not based on the whims of the divider, but according to the lot assigned by the Lord. Therefore, Joshua himself, the one who allocated the land, did not reserve a distinct territory for himself, so it wouldn't seem he favored himself with the best, but instead received from the leaders of all tribes the territory of Phamnathsareth on Mount Ephraim.