Apparently the apostle Paul, who alone was qualified to write the deep, high, and rich content of this book. The mention of Timothy and the tone of the fellowship also point to Paul as the author (see also note 1 in 1:1
Time of Writing:
Perhaps A.D. 67, after Paul's release from his first Roman imprisonment, while he was in Miletus (2 Tim. 4:20
Place of Writing:
Perhaps Miletus (see verse in the previous item). The mention of ''Those from Italy'' in 13:24
indicates that the book was not written in Rome.
The Hebrew believers, as indicated by the book's content.