The good people at the University of Michigan have kindly put (in response to my request) the exact folio of fourth century A.D. (C.E.) manuscript Papyrus Michigan 3520 with the text of 1 John 5:7-8 in Fayumic Coptic online for everyone to enjoy.
This manuscript is possibly (note, possibly) the oldest of the extant text of 1 John 5:7-8 in existence. Possibly even older than the Greek unicial manuscripts of this passage (Siniaticus, Alexandrianus, Vatican 1209).
Ann Arbor Library, Michigan University, Library P. 3520 [Papyrus Michigan 3520]
Coptic Fayumic dialect F4, (circa. 4-5th century C.E.)
Official citation:
“P.Mich.inv. 3520; Recto.” https://quod.lib.umich.edu/a/apis/x-16722/3520_p24_57.tif. University of Michigan Library Digital Collections. Accessed: September 12, 2021.
Below shows where on the folio 1 John 5:7-8 is found in Coptic:
Schenke / Kasser, Papyrus Michigan 3520 und 6868(a) (Texte und Untersuchungen 151) p. 44-191 (Schenke, Hans-Martin / Kasser, Rodolphe) 2003
Page 20 helped me to find the right folio.
Page 152 gives a reproduction of the text:
Same text enlarged:
The printed text alongside the manuscript itself:
Enlarged image. I’ve put the verse numbering roughly where they are in the printed text. Number 9 should be a little more to the right, but close enough. You get the general idea.
Acknowledgement.
I would like to give a big thankyou to Monica Tsuneishi from the University of Michigan for being so nice to deal with and for processing my request so quickly. Thank you so much.
This is an extremely valuable witness to the Bible text of 1 John 5:7-8.
It does not contain the Comma Johanneum (or Johannine Comma).
The Fathers True Monarchy 