{That is} (houtos estin). The one just mentioned in verse
 20 , "the disciple whom Jesus loved." {And wrote these things}
(kai ho grapsas tauta). Here there is a definite statement that
the Beloved Disciple wrote this book. {We know} (oidamen). The
plural here seems intentional as the identification and
endorsement of a group of disciples who know the author and wish
to vouch for his identity and for the truthfulness of his
witness. Probably we see here a verse added by a group of elders
in Ephesus where John had long laboured.