Again John refers back to Jesus’ words as recorded in his Gospel. Jesus said in John 13:34- 34 “A new command I give you: Love one another. As I have loved you, so you must love one another.” John says here in vv. 7-9- “7 Dear friends, I am not writing you a new command but an old one, which you have had since the beginning. This old command is the message you have heard. 8 Yet I am writing you a new command; its truth is seen in him and in you, because the darkness is passing and the true light is already shining.” John goes on to explain living in the true light means loving your brother and sister.