More early 1 John 5:7 Evidence: The Panoplia Dogmatike (made by Euthymius Zygabenus around 1100AD & first printed in 1710 Editio Princeps) quoted Cyril of Alexandria's (lived 376AD-444AD AD) quotation of all 1 John 5:7-8:"And there are Three who give testimony in heaven, the Father, the Word, and the Holy Ghost. And these three are one. And there are three that give testimony on earth: the spirit and the water and the blood. And these three are one. ...[Bottom page note:] from 1 John V [5], 5-9 [Quote was of ]1 John 5:7-8]...(Euthymius, Panoplia, Chapter 12)[from Cyril of Alexandria, Thesaurus])

Greek:" Ὅτι τρεῖς εἰσιν οἱ μαρτυροῦντες ἐν τῷ οὐρανῷ, ὁ Πατήρ, ὁ Λόγος, καὶ τὸ ἅγιον Πνεῦμα· καὶ οὗτοι οἱ τρεῖς ἕν εἰσι. Καὶ τρεῖς εἰσιν οἱ μαρτυροῦντες ἐν τῇ γῇ, τὸ Πνεῦμα καὶ τὸ ὕδωρ, καὶ τὸ αἷμα· καὶ οἱ τρεῖς εἰς τὸ ἐν εἰσὶν...1 Joan [John] 5:6-9"(Migne Graeca, PG 130.871-872 [quote from Cyril of Alexandria, Thesaurus;] [also found in] Migne Graeca, PG 75.616]) LINK👉tap Page 871 option; go to the page's right side