Acts 2:42

“And they continued steadfastly in the apostles’ doctrine, etc.] And which is the same with the doctrine of Christ, of which he is the author, preacher, and subject; the substance of which is peace, pardon, righteousness, and salvation by him: this the apostles received from Christ, and constantly taught in their ministry; for which reason, it is called theirs; and this these young converts had embraced gladly; and were not only believers of it, but persevering believers; they were constant hearers of it; they continually attended on the ministry of the apostles, and held fast the form of sound words they had received from them; and stood fast in the faith of the Gospel, notwithstanding all…”

“continued steadfastly in--"attended constantly upon." the apostles' doctrine--"teaching"; giving themselves up to the instructions which, in their raw state, would be indispensable to the consolidation of the immense multitude suddenly admitted to visible discipleship. fellowship--in its largest sense. breaking of bread--not certainly in the Lord's Supper alone, but rather in frugal repasts taken together, with which the Lord's Supper was probably conjoined until abuses and persecution led to the discontinuance of the common meal. prayers--probably, stated seasons of it.”

“And they continued stedfastly - They persevered in, or they adhered to. This is the inspired record of the result. That any of these apostatized is nowhere recorded, and is not to be presumed. Though they had been suddenly converted; though they were suddenly admitted to the church; though they were exposed to much persecution and contempt, and to many trials, yet the record is that they adhered to the doctrines and duties of the Christian religion. The word rendered “continued stedfastly” - προσκαρτεροῦντες proskarterountes - means “attending one, remaining by his side, not leaving or forsaking him.” The apostles’ doctrine - This does not mean that they held or believed the doctrines of…”

“And they continued steadfast - So their daily Church communion consisted in these four particulars: Hearing the word; Having all things common; Receiving the Lord's Supper; Prayer. Ye diff'rent sects, who all declare, Lo here is Christ, and Christ is there; Your stronger proofs divinely give, And show me where the Christians live! Acts 2:43”

“2:42-47 Luke makes a clear connection between personal faith and membership in the Christian community. Life in this new community involved devotion to the apostolic teaching of God’s Word, fellowship, sharing, joy, and praise, and it resulted in the Lord’s continuing to add to their number those who were being saved. 2:42 fellowship: Greek koinōnia, a close mutual relationship and participation in life together. • At this stage, prayer probably included participation in the formal prayers of the Temple (see 3:1).”

“they: Act 2:46, Act 11:23, Act 14:22; Mar 4:16, Mar 4:17; Joh 8:31, Joh 8:32; Co1 11:2; Gal 1:6; Eph 2:20; Col 1:23; Ti2 3:14; Heb 10:39; Pe2 3:1, Pe2 3:2, Pe2 3:17, Pe2 3:18; Jo1 2:19 fellowship: Act 4:23, Act 5:12-14; Jo1 1:3, Jo1 1:7 in breaking: Act 20:7, Act 20:11; Co1 10:16, Co1 10:17, Co1 10:21, Co1 11:20-26 and in prayers: Act 1:14, Act 4:31, Act 6:4; Rom 12:12; Eph 6:18; Col 4:2; Heb 10:25; Jde 1:20 Acts 2:43”