1 John 5:7

7. For Scholars are agreed, at the present day, that this entire verse and the words in earth in the following verse are not genuine; being a late interpolation and not the words of St. John. They are omitted in all Greek manuscripts previous to the sixteenth century; by all the Greek fathers, and by many of the Latin fathers. They are omitted in the early editions of the Latin Vulgate. The text was never used by the Orthodox fathers of the early Church in defending the doctrine of the Trinity against Arius. That doctrine was established in the Church without any aid from this text. It is not needed for that purpose now, and it cannot be justifiably quoted as proof in that discussion.