Isaiah 66:12

“For thus saith the Lord, behold, I will extend peace to her like a river, &c.] As the river Euphrates, so the Targum; or as the Nile, which overflowed Egypt, and made it fruitful; or as any flowing river, large and spreading, continuing to flow, and brings blessings with it where it comes; and so denotes the abundance of this peace, the perpetuity of it, and its blessed effects. This respects not the first times of the Gospel; for though Christ the peacemaker came and made peace by his blood, and went and preached peace to Jews and Gentiles, and many enjoyed spiritual peace in believing, flowing from his blood and righteousness, yet there was very little outward peace to the churches of…”

“extend--I will turn peace (prosperity) upon her, like a river turned in its course [GESENIUS]. Or, "I will spread peace over her as an overflowing river" [BARNES], (Isa 48:18). flowing stream--as the Nile by its overflow fertilizes the whole of Egypt. borne upon . . . sides--(See on Isa 60:4). her . . . her--If "ye" refers to the Jews, translate, "ye shall be borne upon their sides . . . their knees," namely, those of the Gentiles, as in Isa 49:22; and as "suck" (Isa 60:16) refers to the Jews sucking the Gentile wealth. However, English Version gives a good sense: The Jews, and all who love Jehovah (Isa 66:10), "shall suck, and be borne" by her as a mother.”

“For thus saith the Lord - This verse contains a promise of the conversion of the Gentiles, and the fact that what constituted their glory would be brought and consecrated to the church of God. I will extend - The word rendered, I will extend ( נטה nâṭâh) means properly to stretch out, as the hand or a measure; then to spread out or expand, as a tent is spread out, to which it is often applied Genesis 12:8; Genesis 26:5; or to the heavens spread out over our heads like a tent or a curtain Isaiah 40:22. Here it may mean either that peace would be spread out over the country like the Nile or Euphrates spread out over a vast region in an inundation; or it may mean, as Gesenius supposes, ‘I…”

“Like a river - It is plain this prophecy relates to a farther conversion of the Jews than hath been yet seen. Ye - Ye Jews also. Her sides - The Gentiles were borne upon the sides of Jerusalem and dandled upon her knees, as first hearing from the Apostles (who were members of the Jewish church) the glad tidings of salvation. Isaiah 66:13”

“66:12 a river: The people, who lost peace and prosperity in the Exile, would receive it back abundantly (see 48:18).”

“I will: Isa 9:7, Isa 48:18, Isa 60:5; Psa 72:3-7 the glory: Isa 66:19, Isa 66:20, Isa 45:14, Isa 49:19-23, Isa 54:3, Isa 60:4-14 then: Isa 66:11, Isa 60:16 ye shall: Isa 60:4 Isaiah 66:13”

“The reason is now given, why the church of the future promises such abundant enjoyment to those who have suffered with her. "For thus saith Jehovah, Behold, I guide peace to her like a river, and the glory of the Gentiles like an overflowing stream, that ye may suck; ye shall be borne upon arms, and fondled upon knees." Jehovah guides or turns ( Gen 39:21) peace to Jerusalem, the greatest of all inward blessings, and at the same time the most glorious of all the outward blessings, that are in the possession of the Gentile world (kâbhōd as in Isa 56:6), both of them in the richest superabundance ("like a river," as in Isa 48:18), so that (perf. cons.) "ye may be able to suck yourselves full…”