1 John 3:10, 16
1 John 3:10 NASB1995
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.
1 John 3:16 NASB1995
We know love by this, that He laid down His life for us; and we ought to lay down our lives for the brethren.