1 Corinthians 15:3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
Again it appears you are not reading carefully what i said, as i made a distinction btwn sermons in Acts versus teaching to Christians, which is what your examples consist of. Though i do not see Paul as being the author of Hebrews (lacks his passion, etc.) but which is a key book.
Did they preach something different than what they wrote? Was there two different gospels?