ISB ~ Hebrews 2 v3

attested to us:The apostles of Jesus were the primary witnesses to all that he had said and done (Acts 1:21-22; 10:39). The author of Hebrews was not among this original group, but he was part of a second wave of missionary preachers whose message was derived from them. Many read this as evidence against the tradition of Pauline authorship. The argument is not decisive, however, since Paul was not an eye-and-ear witness to the earthly ministry of Jesus; in fact, his preaching had to be confirmed by the original apostles (Gal 2:1-6) and was partly derived from them in the form of apostolic tradition (1 Cor 11:23; 15:3).