Evidence suggests that Hebrews was written by a lady, Priscella. The author was known to the first recipients of the letter, it was changed as a man’s name in about the 4th century A.D. Paul was credited as the author.
The first glaring rejoinder to this view is that, while Paul always attached his name to his letters, Hebrews has no such attachment. Thus, Paul cannot be, and is not, the writer.
The oldest manuscripts have the title pros hebraios (“to the Hebrews). This is the title given by by early Egyptian versions, which are authentic.
Hebrews 13:22 reads:” I appeal to you, brethren, bear with my word of explanation, for I have written to you briefly.” However, Hebrews is not very brief. What does this statement mean? Moulton and Milligan translate the verse to mean “I appeal to you brothers, bear with my words of instruction and admonition, for my commands have been but brief.”