The Didache (anonymously-written Christian text, created around year 100)
“Every prophet who teaches the truth but fails to practice what he preaches is a false prophet.”
- The anonymously-written Didache (“The Teaching”), chapter 11, section 10, translated by Cyril C. Richardson (1970) in After The New Testament: A Reader In Early Christianity, edited by Bart D. Ehrman. New York: Oxford University Press, 1999.