Arcana Coelestia #6300
6300. And he set Ephraim before Manasseh. That this signifies that he accounted truth as being in the first place, because he was spiritual, is evident from what has been unfolded above (verses 13-14, 17-19).
Genesis 48:17-19
17
When Joseph saw that his father laid his right hand on the head of Ephraim, it displeased him. He held up his father's hand, to remove it from Ephraim's head to Manasseh's head.
18
Joseph said to his father, "Not so, my father; for this is the firstborn; put your right hand on his head."
19
His father refused, and said, "I know, my son, I know. He also will become a people, and he also will be great. However, his younger brother will be greater than he, and his seed will become a multitude of nations."