1 Corinthians 3:1 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ.
3:2 I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.
3:3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
3:4 For while one saith, I am of Paul; and another, I am of Apollos; are ye not carnal?
The Corinth Believers were called saints, saved yet some of them were still carnal, walking as men. The carnality includes envy, strife and division, they still sin yet saved by the grace of God. They weren't sinless perfect.