1 John 3:8-10

8 He that doeth sin, is of the devil; for the devil sinneth from the beginning. In this thing the Son of God appeared, that he undo the works of the devil.

9 Each man that is born of God, doeth not sin; for the seed of God dwelleth in him, and he may not do sin [and he may not sin], for he is born of God.

10 In this thing the sons of God be known, and the sons of the fiend. Each man that is not just, is not of God, and he that loveth not his brother [and he that loveth not his brother, is not of God].