Acts 1 — Jamieson–Fausset–Brown
1:1–2
1-2. former treatise--Luke's Gospel. Theophilus--(See on Lu 1:3). began to do and teach--a very important statement, dividing the work of Christ into two great branches: the one embracing His work on earth, the other His subsequent work from heaven; the one in His own Person, the other by His Spirit; the one the "beginning," the other the continuance of the same work; the one complete when He sat down at the right hand of the Majesty on high, the other to continue till His second appearing; the one recorded in "The Gospels," the beginnings only of the other related in this book of "The Acts." "Hence the grand history of what Jesus did and taught does not conclude with His departure to the Father; but Luke now begins it in a higher strain; for all the subsequent labors of the apostles are just an exhibition of the ministry of the glorified Redeemer Himself because they were acting under His authority, and He was the principle that operated in them all" [Olshausen].
1:3–5
3-5. showed himself alive--As the author is about to tell us that "the resurrection of the Lord Jesus" was the great burden of apostolic preaching, so the subject is here filly introduced by an allusion to the primary evidence on which that great fact rests, the repeated and undeniable manifestations of Himself in the body to the assembled disciples, who, instead of being predisposed to believe it, had to be overpowered by the resistless evidence of their own senses, and were slow of yielding even to this (Mr 16:14). after his passion--or, suffering. This primary sense of the word "passion" has fallen into disuse; but it is nobly consecrated in the phraseology of the Church to express the Redeemer's final endurances. seen of them forty days--This important specification of time occurs here only. speaking of--rather "speaking." the things pertaining to the kingdom of God--till now only in germ, but soon to take visible form; the earliest and the latest burden of His teaching on earth.
1:6–8
6-8. wilt thou at this time restore the kingdom to Israel?--Doubtless their carnal views of Messiah's kingdom had by this time been modified, though how far it is impossible to say. But, as they plainly looked for some restoration of the kingdom to Israel, so they are neither rebuked nor contradicted on this point.
1:9–11
9-11. while they beheld, he was taken up--See on Lu 24:50-53. Lest it should be thought He had disappeared when they were looking in some other direction, and so was only concluded to have gone up to heaven, it is here expressly said that "while they were looking He was taken up, and a cloud received Him out of their sight." So Elijah, "If thou see me when I am taken from thee" (2Ki 2:10); "And Elisha saw it" (Ac 1:12). (See on Lu 9:32.)
1:12–14
12-14. a sabbath day's journey--about two thousand cubits.
1:15–26
15-26. in those days--of expectant prayer, and probably towards the close of them, when the nature of their future work began more clearly to dawn upon them, and the Holy Ghost, already "breathed" on the Eleven (Joh 20:22), was stirring in Peter, who was to be the leading spirit of the infant community (Mt 16:19). the number ... about an hundred and twenty--Many, therefore, of the "five hundred brethren" who saw their risen Lord "at once" (1Co 15:6), must have remained in Galilee.