“All the people who emerged from the loins of Jacob were seventy souls, and Joseph was in Egypt” (Exodus 1:5). “All the people who emerged from the loins of Jacob,” including Joseph who was in Egypt, were seventy. Alternatively, “and Joseph was in Egypt” [teaches that] even though Joseph ascended to royalty, he did not relate to his brothers and his father’s household with haughtiness. Just as he was insignificant in his [own] eyes initially when he was a slave in Egypt, so too, he was insignificant in his [own] eyes after he was king.
Wisdom of Joseph of Egypt
Shemot Rabbah 1:7