Joseph consented to do his father's will, and Jacob tithed his sons, consecrating Levi to the Holy One, and appointing him to be the chief of his brethren. He enjoined his sons to have a care that there should never fail them a son of Levi in the priestly succession. And it happened that. of all the tribes Levi was the only one that never proved faithless to the covenant of the fathers.
Thus Jacob adopted Manasseh and Ephraim to be his own sons, even as Reuben and Simon were his sons. They were entitled like the others to a portion in the Holy Land, and like the others they were to bear standards on their journey through the desert.