Whoever remains in him doesn't sin. Whoever sins hasn't seen him, neither knows him.
There was no sin whatsoever in Jesus Christ (1 John 3:5). He consistently abode in (obeyed) the Father (cf. John 14:9). The Christian who consistently "abides" in a sinless Person does not sin (1 John 3:6). If we could abide in Christ without interruption, we would be sinless. Unfortunately we cannot do that.