If you could point me to where Paul has said this (or even hinted that this is so) then you will have done something that no other individual has ever been able to do before you. As I've said previously, way back in the 1970's 1Cor 13:10 became the proverbial
golden nail in the coffin of cessationism, where once people had the scales fall from their eyes then many millions of cessationists were able to realise that Paul was speaking of the future Kingdom of God, the Parousia, where Jesus will return to establish God's Kingdom here on earth. You are right in that Paul is not specifically speaking about Jesus, but with the Kingdom of God where Jesus will return as its head.
Back in post #240 I provided a sample of the views of some of the leading theologians of our day, where I even quoted Daniel B. Wallace who is a leading cessationist (though from what I have been reading this week he does seem to be a very uncomfortable cessationist), where even he acknowledges that 13:10 is pointing to the future Kingdom of God, where he actually refers to the return of Jesus but this is just semantics as it is Jesus who will be at the head of the Heavenly army.
If anyone has a commentary (or something similar) that has been written by a scholar since the 1980's who still believes that 1Cor 13:10 refers to either the death of the last Apostle or to the completion of the Canon then I would certainly appreciate a link to such an oddity.
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Greek Grammar Beyond the Basics: An Exegetical Syntax of the New Testament, Daniel B. Wallace (1996) (cessationist)
1 Cor 13:10 όταν δε ελθη τό τέλειον, τό έκ μέρους καταργηθήσεται whenever the perfect comes, the partial will be done away
Although there can be no objection to the τέλειον referring to the completion of the canon grammatically (for the adj. would naturally be neuter if it referred to a thing, even if the inferred noun were feminine, such as γραοή), it is difficult to see such a notion in this passage, for this view presupposes that (1) both Paul and the Corinthians knew that he was writing scripture, and (2) the apostle foresaw the completion of the NT before the Lord's return.6 A more likely view is that "the perfect" refers to the coming of Christ7 (note the terminus given in v 12 (τότε) as "face to face," a personal reference that does not easily comport with the canon view).8
Cf. also Matt 19:17; 27:29;
Mark 1:4;
Acts 5:31; Rom 8:34; 12:9, 21; 1 Cor 1:20, 25-28; Gal 4:27; Eph 1:20; 2:14,16; 1 Tim 5:16; Heb 1:3; 1 Pet 4:18;
1 John 2:20; Rev 3:7.
Footnotes:
6 G. D. Fee, The First Epistle to the Corinthians (NICNT) 645, n. 23, remarks that this "is an impossible view, of course, since Paul himself could not have articulated it."
7 One cannot object that the reference is not to the coming of Christ because the adj. is neuter, since the neuter adj. is sometimes used for persons for masons of rhetoric, aphoristic principle, suspense, etc. Cf. Matt 12:6,41; 1 Cor 1:27-28; Heb 7:7.
8 This is not necessarily to say that the sign gifts would continue until the Second Coming, for in Paul's mind he would be alive when Christ returned (cf. 1 Thess 4:15). Such an anticipation summarily removes this text from supporting either the charismatic or cessationist position on sign gifts.