Genesis 48:5

Now before the year of famine came, two sons were born to Joseph, whom Asenath, the daughter of Potiphera priest of On, bore to him.

For the sons of Joseph were two tribes, Manasseh and Ephraim, and they did not give a portion to the Levites in the land, except cities to live in, with their pasture lands for their livestock and for their property.

Thus says Lord Yahweh, “This shall be the boundary by which you shall apportion the land for an inheritance among the twelve tribes of Israel; Joseph shall have two portions.

By faith Jacob, as he was dying, blessed each of the sons of Joseph, and worshiped, leaning on the top of his staff.