1 Corinthians 16:13

In this passage the apostle gives, I. Some general advices; as, 1. That they should watch (Co1 16:13), be wakeful and upon their guard. A Christian is always in danger, and therefore should ever be on the watch; but the danger is greater at some times and under some circumstances. The Corinthians were in manifest danger upon many accounts: their feuds ran high, the irregularities among them were very great, there were deceivers got among them, who endeavoured to corrupt their faith in the most important articles, those without which the practice of virtue and piety could never subsist. And surely in such dangerous circumstances it was their concern to watch. Note, If a Christian would be secure, he must be on his guard; and the more his danger the greater vigilance is needful for his security. 2. He advises them to stand fast in the faith, to keep their ground, adhere to the revelation of God, and not give it up for the wisdom of the world, nor suffer it to be corrupted by it - stand for the faith of the gospel, and maintain it even to death; and stand in it, so as to abide in the profession of it, and feel and yield to its influence. Note, A Christian should be fixed in the faith of the gospel, and never desert nor renounce it.

— Matthew Henry's Concise Commentary (public domain)

He shows that they ought to make their hopes of salvation to depend not on Apollos or any other teacher; that it rests with themselves. "Watch ye": for ye are slumbering. "Stand": for ye are like men tottering. "Quit you like men; be strong": for ye are effeminate (Co1 16:14). "Let all your things be done with charity" (Co1 8:1; Co1 13:1): not with strifes as at present [CHRYSOSTOM]. "In the faith" which was assailed by some (Co1 15:1-2, Co1 15:12-17).

— Jamieson-Fausset-Brown Commentary (public domain)