The first list of the 27 books of the New Testament canon
The importance of fasting during Lent
The significance of the episcopal hierarchy
The rules for monastic life
Answer
Athanasius, a Christian bishop in Alexandria, Egypt, mentioned the first list of the 27 books of the New Testament canon in his Easter letter of 367. The list included all the books that are now considered canonical by most Christians.
The Remarkable Life of Athanasius: Exploring the Legacy of the Coptic Pope