In his opening greeting Paul mentions Sosthenes our brother (1 Corinthians 1:1)
Paul calls them sanctified in Christ Jesus, called to be saints (1:2).
They call on the name of Jesus as do all others who are in Christ (1:2).
The grace of God was given to them by Jesus Christ (1:4).
They are enriched by Jesus Christ in all utterance and in all knowledge (1:5).
The testimony of Christ was confirmed in them (1:6).
They come behind no one in the gifts of God (1:7).
God will confirm them until the end so that they may be blameless in the day of Christ because God is faithful by whom they were called into fellowship with Jesus Christ (1:8-9).
Twenty two times Paul calls them brethren (1 Corinthians 1:10, 11, 26; 2:1; 31: 4:26; 7:24, 29; 10:1; 11:2, 33; 12:1; 14:6, 20, 26, 39: 15:1, 15:50, 58, 16:15; 2 Corinthians 1:8; 8:1; 13:11) .
Paul tells them they have received the Spirit of God (1 Corinthians 1;12).
Paul tells them they are babes in Christ (1 Co 3:1).
Paul refers to himself and Apollos as ministers by whom the Corinthians had believed the gospel (1 Co 3:5).
Paul tells them “ye are God’s husbandry, ye are God’s building” (1 Co 3:9).
Paul tells them that they are the temple of God and the Spirit of God dwells in them (1 Co 3:16).
Paul tells them that they belong to Christ (1 Co 3:21-23).
In view of his apostleship to them Paul exhorts the Corinthians not to be puffed up because of the things they had received (1 Co 4:6-11).
Paul calls them his beloved sons (1 Co 4:14)
Paul says he had begotten them through the gospel – For though ye have ten thousand instructors in Christ, yet have ye not many fathers: for in Christ Jesus I have begotten you through the gospel (1 Co 4:15)
Paul rebukes them for tolerating fornication that even those who aren’t saved don’t do (2 Co 5:1).
Paul chastises them for not grieving over the fornication in their midst (1 Co 5).
Paul tells them not to keep company with a person who is called a brother if he is a fornicator, or covetous, or an idolater, or slanderous, or a drunkard, or a swindler, Paul says not to eat with such a person. Paul says he has turned the fornicator over to Satan for the destruction of the flesh so that his spirit would be saved in the day of the Lord Jesus Christ (1 Co 5:4-13).
Paul challenges them not to settle matters before worldly courts but among themselves as saints (1 Co 6:1-8).
Paul reminds them of what manner of persons they were before Christ (fornicators, idolaters, adulterers, effeminate, abusers of themselves with mankind, thieves, covetous, drunkards, revilers, extortioners) and tells them that they were washed, sanctified, and justified in the name of the Lord and by the Spirit of God (1 Co 6:9-11).
Paul tells them their bodies are members of Christ (1 Co 6:15 -17)
Paul tells them again that their bodies is temple of the Holy Ghost which is in them, which they have of God, and they are not their own (1 Co 6:19).
Paul tells them they are bought with a price, and they are to glorify God in your body, and in your spirit, which are God’s (1 Co 6:20).
Paul instructs them regarding marriage and divorce in view of Christian marriage (1 Co 7)
Paul tells the married among them not to not to withhold themselves from their spouse unless it is with consent for a time of fasting and prayer (1 Co 7:4-5)
Paul instructs both the men and women among the Corinthians believers concerning what they are to do if any of them have a spouse who isn’t a believer (1 Co 7:13-16).
Paul tells them they are bought with a price (1 Co 7:23)
Paul instructs the widows, telling them they are free to married whoever they want to as long as they marry “in the Lord,” i.e., marry a believer (1 Co 7: 39).
Paul tells them that though there are many that the world refers to as god, TO THEM there is but one God, the Father, of whom are all things, and WE IN HIM; and one Lord Jesus Christ, by whom are all things, and WE BY HIM (1 Co 8:4-6).
Paul tells them to be careful not to allow their liberty in Christ, regarding the eating of meats which may have been offered to idols, to become a stumbling block for others whose conscience is weak (1 Co 8:6-12)
Paul tells them that when they sin against their weak brothers in Christ they sin against Christ (2 Co 8:12).
Paul informs them that he is an apostle, and they are his work in the Lord (1 Co 9:1).
Paul calls them the seal of his apostleship (1 Co 9:2).
Paul speaks to them about the communion table saying; “the cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? For we being many are one bread, and one body: for we are ALL PARTAKERS OF THAT ONE BREAD (1 Co 10:16-17).
Paul tells them to follow him as he follows Christ (1 Co 11:1)
Paul tells them as brethren to keep the ordnances he had taught them, concerning the family at home (regarding husband and wife) and the coming together to break bread at the Lord’s table (1 Co 11:2-34).
Paul instructs them as brethren concerning the gifts of the Holy Spirit (1 Co 12).
Paul tells them that they are members of the body of Christ (1 Co 12:12-27).
Paul explains how God has set each member in the body of Christ and given to each one gifts that please him (1 Co 12).
Paul tells them to covet the best gift (1 Co 12:31).
Paul explains to them the importance of love as the best way to minister the spiritual gifts God has given them (1 Co 13:1 – 14:1).
Paul gives them instructions for the proper use of tongues and prophecy when they come together (1 Co 14) so that if someone who is unlearned or an unbeliever happens to come to their assembly, it will be convicting to the unbeliever and persuade them that God is in their midst (1 Co 14:23-24).
Paul speaks to them concerning how to conduct their assemblies as brethren who are saints in the Lord (1 Co 14:25-33, 40).
Paul tells them that he preached the gospel to them and by that gospel they are saved is that hold fast to it (1 Corinthians 15:1-4).
Paul tells them of the hope of resurrection which they have at the coming of the Lord (1 Co 15) and says to them “thanks be to God, which giveth us the victory through our Lord Jesus Christ. Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labor is not in vain in the Lord (v. 57-58).
Paul gives them instruction concerning the collection for helping the saints (1 Co 16:1-2).
Paul exhorts them as brethren concerning how they are to greet, host, and treat others who are their brethren in Christ and ministers in the Lord (1 Co 16).