Sforno on Deuteronomy 33:17/ספורנו על דברים ל״ג:י״ז

1בכור שורו, although Yehudah is the leader of the tribes, just as the lion is the leader of the free roaming beasts, the ox ranks first among the domesticated pure animals, as we know from a comment by our sages in Chagigah 13 that the lion is the king among the predators whereas the ox is the king among the domesticated animals. This makes Joseph rank second among twelve tribes. Compare Hoseah 13,1 כדבר אפרים רתת נשא הוא בישראל, “when Ephrayim spoke piety in Israel he was exalted.” The prophet spoke of the earlier generations such as when Joshua was the leader, when Ephrayim was highly esteemed. in the eyes of G‘d as well as by the people.

2הדר לו, even though he does not enjoy the official position of being Royalty, he is fit and deserving of such honours.

3בהם עמים ינגח יחדו, he, together with the tribe of Yehudah, proving Royalty will prevail over many nations by locking horns with them. Compare Isaiah 11,13-14 “then Ephrayim’s envy shall cease and Yehudah’s harassment shall end; Ephrayim shall not envy Yehudah, and Yehudah shall not harass Ephrayim. They shall pounce on the back of the Philistines to the west and together they shall topple peoples of the east.”