386 AD: John Chrysostom refered to both 1 John 5:7 & 1 John 5:8 in Greek
👉Greek “Κάτω τρεῖς μάρτυρες, ἄνω τρεῖς μάρτυρες, τὸ ἀπρόσιτον τῆς τοῦ Θεοῦ δόξης δηλοῦντες.” (Adversus Judeos, Homily 1:3 LINK)

👉English: “Three witnesses below, three witnesses above, showing the inaccessibility of God’s glory."(Translated by KJV Today Link)
👉Another English translation: "So there were three witnesses on earth and three in Heaven who made it clear that God’s glory cannot be approached."(Homily 1:3 on Page 1) LINK
💯This proves John Chrysostom had early Greek manuscripts of 1 John 5:7-8, since he mentioned "three witnesses above" (Κάτω τρεῖς μάρτυρες,) which is only found in & from 1 John 5:7's words of "For there are three that bear record in heaven, the Father, the Word, & the Holy Ghost, and these three are one", & mentioned "three witnesses below" (ἄνω τρεῖς μάρτυρες,) which only refers to "And there are three that bear witness in the earth,...and these are one". Note: John Chrysostom lived from 349AD – 407 AD.