And it shall come to pass afterward, that I will pour {q} out my spirit upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream {r} dreams, your young men shall see visions:

(q) That is, in greater abundance, and more broadly than in times past. And this was fulfilled under Christ, when God's graces and his Spirit under the Gospel were abundantly given to the Church; Isa 44:3 Ac 2:17 Joh 7:38-39.

(r) As they had visions and dreams in ancient times, so will they now have clearer revelations.

Wesley's Notes

2:28 Afterward - After the return out of Babylon, after the various troubles and salvations by which these may know that I am the Lord. I will pour - In extraordinary gifts on the first preachers of the gospel, and in various graces to all believers. Upon all flesh - Before these gifts were confined to one particular nation; but now they shall be enlarged to all nations, and all that believe. Shall prophesy - This was in part fulfilled according to the letter in the first days of the gospel; but the promise means farther, by pouring out of the spirit on your sons and your daughters, they shall have as full a knowledge of the mysteries of God's law, as prophets before time had. Shalt dream dreams - This also was literally fulfilled in the apostles days. But it may mean farther, the knowledge of God and his will, shall abound among all ranks, sexes and ages in the Messiah's days, and not only equal, but surpass all that formerly was by prophesy, dreams, or visions.

Scofield Reference Notes

[1] afterward

Cf. Acts 2:17 which gives a specific interpretation of "afterward" (Heb. acherith= "latter," "last"). "Afterward" in Joel Joel 2.28 means "in the last days" (Gr. eschatos), and has a partial and continuous fulfilment during the "last days" which began with the first advent of Christ Heb 1:2 but the greater fulfilment awaits the "last days" as applied to Israel. See Scofield Note: "Acts 2.17", for phrase, "the last days." See Scofield Note: "Acts 2:17".

Jamieson-Fausset-Brown Bible Commentary

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.

Matthew Henry's Concise Commentary

2:28-32 The promise began to be fulfilled on the day of Pentecost, when the Holy Spirit was poured out, and it was continued in the converting grace and miraculous gifts conferred on both Jews and Gentiles. The judgments of God upon a sinful world, only go before the judgment of the world in the last day. Calling on God supposes knowledge of him, faith in him, desire toward him, dependence on him, and, as evidence of the sincerity of all this, conscientious obedience to him. Those only shall be delivered in the great day, who are now effectually called from sin to God, from self to Christ, from things below to things above.