. . . there is no evidence
whatsoever that the apostles did not write down all their teachings in the New
Testament documents. (Jack D. Kilcrease, Holy Scripture [Confessional
Lutheran Dogmatics 2; Ft. Wayne, Ind.: The Luther Academy, 2020], 219)
For one to hold Sola Scriptura, one must believe that what the apostles orally taught is to be found substantially in the biblical texts. Of course, this begs many questions. For more, see
Not By Scripture Alone: A Latter-day Saint Refutation of Sola Scriptura