1 John 2:7

2:7 Dear friends, I am not writing a new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the word that you have already heard.

1 John 2:13-14

2:13 I am writing to you, fathers, that you have known him who has been from the beginning. I am writing to you, young people, that you have conquered the evil one. 2:14 I have written to you, children, that you have known the Father. I have written to you, fathers, that you have known him who has been from the beginning. I have written to you, young people, that you are strong, and the word of God resides in you, and you have conquered the evil one.

1 John 2:21

2:21 I have not written to you that you do not know the truth, but that you do know it, and that no lie is of the truth.

1 John 1:4

1:4 Thus we are writing these things so that our joy may be complete.