Psalms 78:9

“The children of Ephraim being armed, and carrying bows, etc.] Or “casting” arrows out of the “bow” f1105; they went out well armed to meet the enemy, and they trusted in their armour, and not in the Lord; and being skilful in throwing darts, or shooting arrows, promised themselves victory: but turned back in the day of battle; fled from the enemy, could not stand their ground when the onset was made: what this refers to is not easy to determine; some think this with what follows respects the defection of the ten tribes in Rehoboam’s time, which frequently go under the name of Ephraim; but we have no account of any battle then fought, and lost by them; and besides the history of this psalm…”

“The children of Ephraim - The sons of Ephraim; that is, the descendants of Ephraim; the tribe of Ephraim. Ephraim was one of the “largest” of the tribes of Israel, and was the “chief” tribe in the rebellion, and hence, the term is often used to denote the “ten” tribes, or the kingdom of Israel, in contradistinction from that of Judah. See Isaiah 7:2, Isaiah 7:5,Isaiah 7:8-9, Isaiah 7:17; Isaiah 11:13; Isaiah 28:1. The word is evidently used in this sense here, not as denoting that one tribe only, but that tribe as the head of the revolted kingdom; or, in other words, the name is used as representing the kingdom of that name after the revolt. See 1 Kings 12:0. This verse evidently contains…”

“Ephraim - That Ephraim is here put for all Israel seems evident from the following verses, wherein the sins, upon which this overthrow is charged, are manifestly the sins of all the children of Israel, and they who are here called Ephraim are called Jacob and Israel, Psa 78:21, and this passage may refer to that dreadful overthrow related, Sa1 4:10-11, which is particularly named, because as the ark, so the flight was in that tribe. And the psalmist having related this amazing providence, falls into a large discourse of the causes of it, namely, the manifold sins of that and the former generations, which having prosecuted from hence to Psa 78:60, he there returns to this history, and relates…”

“78:9-11 Ephraim, the second son of Joseph, received a special blessing from Jacob (Gen 48:15-20; 49:22-26; Deut 33:13-17). The land that his descendants received included fertile valleys and strategic roads (Judg 8:2). However, the people of Ephraim did not live in obedience to God’s gracious covenant.”

“The children: Some think this refers to a defeat of the Ephraimites mentioned in Ch1 7:20-22; but it probably refers to the conduct and defeat of the ten tribes of which Ephraim was the head. Nothing is recorded in the history of Israel concerning the cowardice of the Ephraimites, as distinct from that of the other tribes. some therefore think, "that the children of Ephraim" is put by a figure of speech for the nation in general. Deu 1:41-44; Jos 17:16-18; Sa1 4:10, Sa1 31:1 carrying: Heb. throwing forth turned: Jdg 9:28, Jdg 9:38-40; Luk 22:33 Psalms 78:10”