1 John 5:11-13

5:11 And this is the testimony: God has given us eternal life, and this life is in his Son. 5:12 The one who has the Son has this eternal life; the one who does not have the Son of God does not have this eternal life.

Assurance of Eternal Life

5:13 I have written these things to you who believe in the name of the Son of God so that you may know that you have eternal life.