V.17-19 Again we come to sad things in the assembly — divisions. This comes from disobedience. We can see why there were disorders in this assembly. “Heresies” and “sects” are the same thing. A man who divides believers is doing evil.
V.19 Many people say, “oh well, everyone has their opinion, it doesn’t matter.” But this verse shows that God is not pleased with divisions, and He will show who is right.
V.20-34 The eating of the Lord’s supper, (chapter 10 deals with the Lord’s table). Paul received his instructions about this by revelation. The truth concerning the assembly and the unity of the body (all believers) were committed to Paul to tell.
V.23-26 The privilege of every believer in the Lord Jesus Christ is to be gathered to His name, and to take the bread and the wine with all those who call upon the Lord out of a pure heart (2 Tim. 2:22). May the Lord give each one of us a tender conscience about this.
V.27-34 But if we are careless in the way we remember the Lord, we leave ourselves open to be condemned by the Lord Himself. That doesn’t mean we would go to hell, but we would be guilty of a serious evil. It would be like insulting the Lord Jesus. And he says that this sort of thing going on, was the reason why many believers were sick. Many had even died!