Who wrote Hebrews?

Question from Leah:

Do we know who wrote Hebrews?

Answer from Pastor Bob:

Nobody knows who wrote the Letter to the Hebrews. The letter itself does not say. It was probably not Paul, for several reasons. The writing style is different from Paul's. Hebrews 2:4 says the gospel "was confirmed to us by those who heard Him," and Paul received the gospel by direct revelation (Galatians 1:12).
The two most popular suggestions for authorship are Barnabas, who was a Jew of the priestly tribe of Levi (Acts 4:36) and would be familiar with the priesthood that is discussed so much in Hebrews, or Apollos, an intellectual (Acts 18:24) associate of Paul who would have used the sophisticated writing style we find in Hebrews. But nobody knows for sure.