1 John 3:1-10 (NASB)
1 Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not. (KJV) 2 Beloved, now we are children of God, and it has not appeared as yet what we will be. We know that when He appears, we will be like Him, because we will see Him just as He is. 3 And everyone who has this hope set on Him purifies himself, just as He is pure.
4 Everyone who practices sin also practices lawlessness; and sin is lawlessness. 5 You know that He appeared in order to take away sins; and in Him there is no sin. 6 No one who remains in Him sins continually; no one who sins continually has seen Him or knows Him. 7 Little children, make sure no one deceives you; the one who practices righteousness is righteous, just as He is righteous; 8 the one who practices sin is of the devil; for the devil has been sinning from the beginning. The Son of God appeared for this purpose, to destroy the works of the devil. 9 No one who has been born of God practices sin, because His seed remains in him; and he cannot sin continually, because he has been born of God. 10 By this the children of God and the children of the devil are obvious: anyone who does not practice righteousness is not of God, nor the one who does not love his brother and sister. (NASB)