E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Drives fat Oxen (Who).
Brook, in his Gustavus Vasa, says: “Who rules o’er freemen should himself be free,” which Dr. Johnson parodied thus: “Who drives fat oxen should himself be fat.” (Boswell’s Life, year 1784.)
