Matthew Henry on 1 Corinthians 16:19–end
The apostle closes his epistle,
I. With salutations to the church of Corinth, first from those of Asia, from Priscilla and Aquila (who seem to have been at this time inhabitants of Ephesus, vid. Act 18:26), with the church in their house (Co1 16:19), and from all the brethren (Co1 16:20) at Ephesus, where, it is highly probable at least, he then was. All these saluted the church at Corinth, by Paul. Note, Christianity does by no means destroy civility and good manners. Paul could find room in an epistle treating of very important matters to send the salutations of friends. Religion should promote a courteous and obliging temper towards all. Those misrepresent and reproach it who would take a…
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salutation . . . with mine own hand--He therefore dictated all the rest of the Epistle.
Adam Clarke on 1 Corinthians 16:21
The salutation of me Paul with mine own hand - This should be rendered: "The salutation is written by the hand of me Paul;" γεγραπται, is written, being understood. It is very likely that the apostle wrote this and the following verses with his own hand. The rest, though dictated by him, was written by an amanuensis.
John Gill on 1 Corinthians 16:21
The salutation of me Paul with mine own hand. The apostle had an "amanuensis", that wrote the epistle for him; but to prevent counterfeits, and that the church to whom he wrote might be assured of the genuineness of the epistle, that it was truly his own, he wrote with his own hand his common salutation; see 2 Thessalonians 3:17, and which is not in the following words, but what is expressed in 1 Corinthians 16:23.
John Calvin on 1 Corinthians 16:13–end
1 Corinthians 16:13-24
13. Watch ye, stand fast in the faith, quit you like men, be strong.
13. Vigilate, state in fide, viriliter agite, robusti estote.
14. Let all your things be done with charity.
14. Omnia vestra in caritate fiant.
15. I beseech you, brethren, (ye know the house of Stephanas, that it is the firstfruits of Achaia, and that they have addicted themselves to the ministry of the saints,)
15. Hortor autem vos, fratres, nostis domum Stephanae, primitias esse Achaiae, atque ut se in ministerium sanctorum ordinaverint:
16. That ye submit yourselves unto such, and to every one that helpeth with us, and laboureth.
16. Ut etiam subiecti sitis tallbus, et omnibus qui cooperan…