Meanwhile a Jew named Apollos, a native of Alexandria, came to Ephesus. He was a learned man, with a thorough knowledge of the Scriptures. 25 He had been instructed in the way of the Lord, and he spoke with great fervor and taught about Jesus accurately, though he knew only the baptism of John. 26 He began to speak boldly in the synagogue. When Priscilla and Aquila heard him, they invited him to their home and explained to him the way of God more adequately.27 When Apollos wanted to go to Achaia, the brothers and sisters encouraged him and wrote to the disciples there to welcome him. When he arrived, he was a great help to those who by grace had believed. 28 For he vigorously refuted his Jewish opponents in public debate, proving from the Scriptures that Jesus was the Messiah. While Apollos was at Corinth, Paul took the road through the interior and arrived at Ephesus. There he found some disciples 2 and asked them, “Did you receive the Holy Spirit when you believed” They answered, “No, we have not even heard that there is a Holy Spirit.”3 So Paul asked, “Then what baptism did you receive?” “John’s baptism,” they replied.4 Paul said, “John’s baptism was a baptism of repentance. He told the people to believe in the one coming after him, that is, in Jesus.” 5 On hearing this, they were baptized in the name of the Lord Jesus. 6 When Paul placed his hands on them, the Holy Spirit came on them, and they spoke in tongues and prophesied. 7 There were about twelve men in all. Acts 18:24-19:7
I've got a theory on who wrote the book of Hebrews and when I looked it up, I'm not the only one. Adolf Von Harnack proposed it in 1900 and Ruth Hoppin developed it extensively. Wish it was like Spurgeon, John McArthur, or R.C.Sproul but sadly Harnack and Hoppin. I'm going to give some reasons why Priscilla wrote the book of Hebrews.
First of all, no one knows who wrote it. That in and of itself makes female authorship credible. No one would have canonized a book written by a female in those days. You say, "What about Ruth and Esther?" Either Samuel, Mordecai, Nehemiah or Ezra but not Ruth or Esther. Many women throughout history have been ghost-writers in order to get their books published. I'm not saying she was a ghost-writer because then a male author would be attributed and it sounds like a deceptive way to get a book in the Bible, but the whole female credibility principle carried over to the early 20th century. I think the book was circulating around to the churches and was so inerrant and helpful that it was just accepted as a church father writing, although because of its unknown authorship it was one of the last books to be canonized.
Second, A lot of people point to Paul as the author because it contains content and phrases that he has used in other epistles. This also would suggest Priscilla because she spent years learning from Paul on a daily basis. She learned so much that a learned scholar like Apollos sat in deference and was instructed on the difference between Old Testament salvation and New Testament salvation, freedom versus law. That is the crux of Hebrews and she thought, if Apollos needs to understand it, other people must be confused, too and judging from the beginning of chapter 19 she was right. Did you know that the epistles are placed in the Bible from longest to shortest? If the church fathers really thought Paul wrote it, they would have placed it after Corinthians. They didn't think he wrote it and neither do I.
Lastly, she did travel during her lifetime and had connections in the growing churches. She certainly had opportunity to send letters that would be received gladly and with authority because she and her husband were known to be Paul's "right hand 'men'." Like Luke, Paul's traveling companion, their words would have carried weight. Luke got canonized, why not Priscilla?
