1 Corinthians 15:2

“By which also ye are saved, etc.] It was the means of their salvation, and had been made the power of God unto salvation to them. Salvation is inseparably connected with true faith in Christ as a Saviour, and with a hearty belief of his resurrection from the dead, which is the earnest and pledge of the resurrection of the saints; and because of the certainty of it in the promise of God, through the obedience and death of Christ, and in the faith and hope of believers, which are sure and certain things, they are said to be saved already. To which the apostle puts in the following provisos and exceptions; the one is, if ye keep in memory what I preached unto you; or rather, “if ye hold fast,…”

“ye are saved--rather, "ye are being saved." if ye keep in memory what I preached unto you--Able critics, BENGEL and others, prefer connecting the words thus, "I declare unto you the Gospel (Co1 15:1) in what words I preached it unto you." Paul reminds them, or rather makes known to them, as if anew, not only the fact of the Gospel, but also with what words, and by what arguments, he preached it to them. Translate in that case, "if ye hold it fast." I prefer arranging as English Version, "By which ye are saved, if ye hold fast (in memory and personal appropriation) with what speech I preached it unto you." unless--which is impossible, your faith is vain, in resting on Christ's resurrection as…”

“By which also ye are saved - On which your salvation depends; the belief of which is indispensable to your salvation; see the note on Mark 16:16. The apostle thus shows the “importance” of the doctrine. In every respect it demanded their attention. It was that which was first preached among them; that which they had solemnly professed; that by which they had been built up; and that which was connected with their salvation. It does not mean simply that by this they were brought into a salvable state (Clarke, Macknight, Whitby, Bloomfield, etc.), but it means that their hopes of eternal life rested on this; and by this they were then “in fact” saved from the condemnation of sin, and were in…”

“Ye are saved, if ye hold fast - Your salvation is begun, and will be perfected, if ye continue in the faith. Unless ye have believed in vain - Unless indeed your faith was only a delusion. 1 Corinthians 15:3”

“15:2 if you continue to believe: Those who continue firm in their faith will be saved (cp. Matt 10:22; 24:13; John 15:6; Gal 5:4; Col 1:23; Heb 6:4-6; contrast 1 Cor 1:8; Rom 8:38-39; Phil 1:6; Heb 6:9).”

“ye are: Co1 1:18, Co1 1:21; Act 2:47 \*Gr: Rom 1:16; Co2 2:15; Eph 2:8; Ti2 1:9 keep in memory: or, hold fast, Co1 15:11, Co1 15:12; Pro 3:1, Pro 4:13, Pro 6:20-23, Pro 23:23; Col 1:23; Th2 2:15; Heb 2:1; Heb 3:6, Heb 3:14, Heb 4:14, Heb 10:23 what I preached: Gr. by what speech I preached unless: Co1 15:14; Psa 106:12, Psa 106:13; Luk 8:13; Joh 8:31, Joh 8:32; Act 8:13; Co2 6:1; Gal 3:4; Jam 2:14, Jam 2:17, Jam 2:26 1 Corinthians 15:3”