5:1-8 The apostle notices a flagrant abuse, winked at by the Corinthians. Party spirit, and a false notion of Christian liberty, seem to have saved the offender from censure. Grievous indeed is it that crimes should sometimes be committed by professors of the gospel, of which even heathens would be ashamed. Spiritual pride and false doctrines tend to bring in, and to spread such scandals. How dreadful the effects of sin! The devil reigns where Christ does not. And a man is in his kingdom, and under his power, when not in Christ. The bad example of a man of influence is very mischievous; it spreads far and wide. Corrupt principles and examples, if not corrected, would hurt the whole church. Believers must have new hearts, and lead new lives. Their common conversation and religious deeds must be holy. So far is the sacrifice of Christ our Passover for us, from rendering personal and public holiness unnecessary, that it furnishes powerful reasons and motives for it. Without holiness we can neither live by faith in him, nor join in his ordinances with comfort and profit.

5. Besides excommunication (of which the Corinthians themselves had the power), Paul delegates here to the Corinthian Church his own special power as an apostle, of inflicting corporeal disease or death in punishment for sin ("to deliver to Satan such an one," that is, so heinous a sinner). For instances of this power, see Ac 5:1-11; 13:11; 1Ti 1:20. As Satan receives power at times to try the godly, as Job (Job 2:4-7) and Paul (2Co 12:7; compare also as to Peter, Lu 22:31), much more the ungodly. Satan, the "accuser of the brethren" (Re 12:10) and the "adversary" (1Pe 5:8), demands the sinner for punishment on account of sin (Zec 3:1). When God lets Satan have his way, He is said to "deliver the sinner unto Satan" (compare Ps 109:6). Here it is not finally; but for the affliction of the body with disease, and even death (1Co 11:30, 32), so as to destroy fleshly lust. He does not say, "for the destruction of the body," for it shall share in redemption (Ro 8:23); but of the corrupt "flesh" which "cannot inherit the kingdom of God," and the lusts of which had prompted this offender to incest (Ro 7:5; 8:9, 10). The "destruction of the flesh" answers to "mortify the deeds of the body" (Ro 8:13), only that the latter is done by one's self, the former is effected by chastisement from God (compare 1Pe 4:6):

the spirit … saved—the spiritual part of man, in the believer the organ of the Holy Spirit. Temporary affliction often leads to permanent salvation (Ps 83:16).