28. afterward--"in the last days" (Isa 2:2) under Messiah after the invasion and deliverance of Israel from the northern army. Having heretofore stated the outward blessings, he now raises their minds to the expectation of extraordinary spiritual blessings, which constitute the true restoration of God's people (Isa 44:3). Fulfilled in earnest (Ac 2:17) on Pentecost; among the Jews and the subsequent election of a people among the Gentiles; hereafter more fully at the restoration of Israel (Isa 54:13; Jer 31:9, 34; Eze 39:29; Zec 12:10) and the consequent conversion of the whole world (Isa 2:2; 11:9; 66:18-23; Mic 5:7; Ro 11:12, 15). As the Jews have been the seedmen of the elect Church gathered out of Jews and Gentiles, the first Gospel preachers being Jews from Jerusalem, so they shall be the harvest men of the coming world-wide Church, to be set up at Messiah's appearing. That the promise is not restricted to the first Pentecost appears from Peter's own words: "The promise is (not only) unto you and to your children, (but also) to all that are afar off (both in space and in time), even as many as the Lord our God shall call" (Ac 2:39). So here "upon all flesh."
      I will pour out--under the new covenant: not merely, let fall drops, as under the Old Testament (Joh 7:39).
      my spirit--the Spirit "proceeding from the Father and the Son," and at the same time one with the Father and the Son (compare Isa 11:2).
      sons . . . daughters . . . old . . . young--not merely on a privileged few (Nu 11:29) as the prophets of the Old Testament, but men of all ages and ranks. See Ac 21:9; 1Co 11:5, as to "daughters," that is, women, prophesying.
      dreams . . . visions-- (Ac 9:10; 16:9). The "dreams" are attributed to the "old men," as more in accordance with their years; "visions" to the "young men," as adapted to their more lively minds. The three modes whereby God revealed His will under the Old Testament (Nu 12:6), "prophecy, dreams, and visions," are here made the symbol of the full manifestation of Himself to all His people, not only in miraculous gifts to some, but by His indwelling Spirit to all in the New Testament (Joh 14:21, 23; 15:15). In Ac 16:9; 18:9, the term used is "vision," though in the night, not a dream. No other dream is mentioned in the New Testament save those given to Joseph in the very beginning of the New Testament, before the full Gospel had come; and to the wife of Pilate, a Gentile (Mt 1:20; 2:13; 27:19). "Prophesying" in the New Testament is applied to all speaking under the enlightenment of the Holy Spirit, and not merely to foretelling events. All true Christians are "priests" and "ministers" of our God (Isa 61:6), and have the Spirit (Eze 36:26, 27). Besides this, probably, a special gift of prophecy and miracle-working is to be given at or before Messiah's coming again.

JFB.