1 John 3:9-10

When God makes someone his child, that person does not go on sinning. The new life God gave that person stays in him. So he is not able to go on sinning, because he has become a child of God. So we can see who God’s children are and who the devil’s children are. Those who do not do what is right are not children of God. And anyone who does not love his brother is not a child of God.