Whoever remains in him doesn't sin. Whoever sins hasn't seen him, neither knows him.
CP: " John is not claiming that Christians do not sin, for he has already said (1:8-10) that if we claim to be without sin, we are liars. The expression “who lives in him,” literally means “abides, or remains” in him. This statement was not intended to mean that we do not sin; it means we do not live a life of sin."