Deuteronomy 33:17

“Comparing the words of Moses with those of Jacob, it will be seen that the patriarch dwells with emphasis on the severe conflicts which Joseph, i. e., Ephraim and Manasseh, would undergo (compare Genesis 49:23-24); while the lawgiver seems to look beyond, and to behold the two triumphant and established in their power. Deuteronomy 33:17 Rather: “The first-born of his” (i. e. Joseph’s) “bullock is his glory”: the reference being to Ephraim, who was raised by Jacob to the honors of the firstborn (Genesis 48:20, and is here likened to the firstling of Joseph’s oxen, i. e., of Joseph’s offspring. The ox is a common emblem of power and strength. return to 'Top of Page'”

“His glory is like the firstling of his bullock - Or young bull, which is a stately creature, and was therefore formerly used as an emblem of royal majesty. This seems to note the kingdom which Ephraim should obtain in Jeroboam and his successors. His horns - His strength and power shall be very great. The people - All that shall oppose him, and particularly the Canaanites. The ten thousands - Of the land of Canaan. Though Manasseh be now more numerous, yet Ephraim shall shortly outstrip him, as was foretold Gen 48:17-19. Deuteronomy 33:18”

“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…”

“the firstling: Ch1 5:1 his horns: Num 23:22, Num 24:8; Job 39:9, Job 39:10; Psa 22:21, Psa 29:6, Psa 92:10; Isa 34:7 unicorns: Heb. an unicorn he shall push: Kg1 22:11; Ch2 18:10; Psa 44:5 the ten thousands: Gen 48:19; Num 26:34, Num 26:37; Hos 5:3, Hos 6:4, Hos 7:1 Deuteronomy 33:18”

“"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…”