2 Corinthians 5:17 (BSB)

Therefore if anyone is in Christ, he is a new creation. The old has passed away. Behold, the new has come!

From 2 Corinthians 5. Also in the ESV.

Commentary on 2 Corinthians 5:17

• John Calvin (Reformed), Calvin's Commentaries on 2 Corinthians 5:17: 17. Therefore if any man is in Christ. As there is something wanting in this expression, it must be supplied in this way — “If any one is desirous to hold some place in Christ, that is, in the kingdom of Christ, or in the Church “Et estre tenu pour membre de ceste saincte compagnie;” — “And to be regarded as a member of that...
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 2 Corinthians 5:16-21: In these verses the apostle mentions two things that are necessary in order to our living to Christ, both of which are the consequences of Christ's dying for us; namely, regeneration and reconciliation. I. Regeneration, which consists of two things; namely, 1. Weanedness from the world: "Henceforth we know no man after the flesh, Co2 5:16.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 2 Corinthians 5:17: And all things are of God,.... A man's being brought into a Gospel church state is of God; the causing all old things to pass away, whether in the Jewish or Gentile world, is of God; the shaking of the heavens and the earth, and the removing of those things that are shaken, the abrogation of the ceremonial law, the putting an end to all...
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on 2 Corinthians 5:17: Verse 17. Therefore if any man be in Christ. The phrase, to "be in Christ," evidently means to be united to Christ by faith; or to be in him as the branch is in the vine--that is, so united to the vine, or so in it, as to derive all its nourishment and support from it, and to be sustained entirely by it.