Deuteronomy 33:17

"The first-born of his ox, majesty is to him, and buffalo-horns his horns: with them he thrusts down nations, all at once the ends of the earth. These are the myriads of Ephraim, and these the thousands of Manasseh." The "first-born of his (Joseph's) oxen" (shor, a collective noun, as in Deu 15:19) is not Joshua (Rabb., Schultz); still less is it Joseph (Bleek, Diestel), in which case the pronoun his ox would be quite out of place; nor is it King Jeroboam II, as Graf supposes. It is rather Ephraim, whom the patriarch Jacob raised into the position of the first-born of Joseph (Gen 48:4.). All the sons of Joseph resembled oxen, but Ephraim was the most powerful of them all. He was endowed with majesty; his horns, the strong weapon of oxen, in which all their strength is concentrated, were not the horns of common oxen, but horns of the wild buffalo (reem, Num 23:22), that strong indomitable beast (cf. Job 39:9.; Psa 22:22). With them he would thrust down nations, the ends of the earth, i.e., the most distant nations (vid., Psa 2:8; Psa 7:9; Psa 22:28). "Together," i.e., all at once, belongs rhythmically to "the ends of the earth." Such are the myriads of Ephraim, i.e., in such might will the myriads of Ephraim arise. To the tribe of Ephraim, as the more numerous, the ten thousands are assigned; to the tribe of Manasseh, the thousands.

Yet Moses has not done with the children of Israel; he seemed to have taken final leave of them in the close of the foregoing chapter, but still he has something more to say. He had preached them a farewell sermon, a very copious and pathetic discourse. After sermon he had given out a psalm, a long psalm; and now nothing remains but to dismiss them with a blessing; that blessing he pronounces in this chapter in the name of the Lord, and so leaves them. I. He pronounces them all blessed in what God had done for them already, especially in giving them his law (Deu 33:2-5). II. He pronounces a blessing upon each tribe, which is both a prayer for and a prophecy of their felicity. 1. Reuben (Deu 33:6). 2. Judah (Deu 33:7). 3. Levi (Deu 33:8-11). 4. Benjamin (Deu 33:12). 5. Joseph (Deu 33:13-17). 6. Zebulun and Issachar (Deu 33:18, Deu 33:19). 7. Gad (Deu 33:20, Deu 33:21). 8. Dan (Deu 33:22). 9. Naphtali (Deu 33:23). 10. Asher (Deu 33:24, Deu 33:25). III. He pronounces them all in general blessed upon the account of what God would be to them, and do for them if they were obedient (Deu 33:26, etc.).

33:17 Ephraim is listed first because he received the blessing of the firstborn over Manasseh (Gen 48:8-22). Manasseh, the firstborn, would normally have received the double portion belonging to the firstborn (cp. Deut 21:17), but Jacob gave it to Ephraim, Joseph’s younger son. Moses’ blessing reflects Jacob’s blessing by listing the tribe of Ephraim as numbering in multitudes (literally tens of thousands) and Manasseh in thousands. After the conquest and establishment of the nation, Ephraim became the dominant tribe of the north; later, after the kingdom was divided following Solomon’s death (1 Kgs 12), the name Ephraim was used interchangeably with Israel in speaking of the northern kingdom.