1 John 1:3-4

3what we have seen and heard we also proclaim to you, so that you too may have fellowship [as partners] with us. And indeed our fellowship [which is a distinguishing mark of born-again believers] is with the Father, and with His Son Jesus Christ.

4We are writing these things to you so that our joy [in seeing you included] may be made complete [by having you share in the joy of salvation].