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^Novum Testamentum Graece, Nestle and Aland, 1991, footnote to verse 13:18 of Revelation, page 659: "-σιοι δέκα ἕξ" as found in C [C=Codex Ephraemi Rescriptus]; for English see Metzger's Textual Commentary on the Greek New Testament, note on verse 13:18 of Revelation, page 750: "the numeral 616 was also read ..."
^Martin, Dale B. (2012). New Testament History and Literature. The Open Yale Courses Series, Yale University Press. ISBN 978-0-300-18085-5. “Modern scholars, though, think the most compelling theory identifies the number with Nero. The letters of the alphabet functioned also as numerals. If one adds up the letters of the name Neron Caesar (spelled in Hebrew, which used the “n” for the ending of the name), the sum is 666. This also makes sense of a textual variant here found in certain ancient manuscripts. Some scribes, thinking of the name as it would appear in Greek rather than Hebrew (and thus without that one “n”), changed the number to 616, which would be the correct addition of the letters of the name spelled in Greek. Thus we know that at least those ancient scribes also took the number to be a reference to Nero.”