The Comma Johanneum is a disputed passage found in 1 John 5:7-8 that refers to "the Father, the Word, and the Holy Ghost" being one. It was inserted into the Latin Vulgate text based on a gloss, but is not found in any Greek manuscripts before the 15th century. While it was included in translations for some time, modern scholarship rejects it due to the lack of evidence in early manuscripts. The Catholic Church no longer maintains it as authentic Scripture.