Whoever denies the Father and the Son is an antichrist. Whoever acknowledges the Son also has the Father. If what you heard from the beginning lives in you, you also will live in the Son and in the Father. Because the world didn't know Him, it doesn't know us. We know that when He appears we will be like Him, because we will see Him just as He is.
Sin is lawlessness.
There is no sin in Him. No one who sins has seen Him or knows Him. The one who practices righteousness is righteous, just as He is righteous. The Son of God appeared for this purpose, that He might destroy the works of the Devil. He can't continue to sin, because he is born of God.