Yes, business, politics, art, the world, may lay claim to authenticity, as you say. (nakedpastor.com)
Jeremias» concern is to establish that these sayings have the same claim to authenticity as those in the gospels, but in his discussion he tends to assume that to do this and to establish their authenticity as sayings of Jesus are one and the same thing. (religion-online.org)
The members of the Seminar determined - quite properly - that sayings attested in the earliest extant sources have the greatest claim to authenticity. (firstthings.com)