“Preachers say, Do as I say, not as I do.”

Source:Anson Chan to Newsweek magazine in 1997.

Do I Have to Say the Words?, written by Bryan Adams, Mutt Lange, and Jim Vallance
Song lyrics, Waking Up the Neighbours (1991)

U.S. Grant's "perfect speech" which he used on several occasions beginning in 1865, as quoted in Grant: A Biography (1982) by William S. McFeely, p. 234.
1860s
Context: I rise only to say that I do not intend to say anything. I thank you for your hearty welcomes and good cheers.

I, 32, reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "I do not love thee, Doctor Fell, / The reason why I cannot tell; / But this alone I know full well, / I do not love thee, Doctor Fell", Tom Brown, Laconics.
Epigrams (c. 80 – 104 AD)

1960s, Why Jesus Called A Man A Fool (1967)
Context: Before I was a civil rights leader, I was a preacher of the Gospel. This was my first calling and it still remains my greatest commitment. You know, actually all that I do in civil rights I do because I consider it a part of my ministry.' I have no other ambitions in life but to achieve excellence in the Christian ministry. I don't plan to run for any political office. I don't plan to do anything but remain a preacher. And what I'm doing in this struggle, along with many others, grows out of my feeling that the preacher must be concerned about the whole man.

Meeting with Barack Obama https://www.youtube.com/watch?v=hSq0q-RrMMQ (February 2009).

I’ve Got A Nietzsche Trigger Finger! (1986)
Context: I tell everyone not to do what I say! I’m behind the odd-ball, my ancestor was Putdown Man! Judge Crater freed me on my own recognizance, I ask: “What would Harpo say?”
For me, know ain’t nothing but no misspelled, and all cretins are liars. I go-for-baroque, I’m a lowlife hierarch, I picked the Locke and entered the Avant-Garden of Eden. I got Spartacus to take the rap for me! I’m the heavyweight Light-Bringer, I'm the out-of-court jester who won't settle, I up the vigilante, I'm a law unto myself but break it anyway! I made a forced landing on the Moebius Strip and now I want to know, which side are you on?

Serena Davies, "In the studio:Peter Blake, http://www.telegraph.co.uk/arts/main.jhtml?xml=/arts/2005/12/13/bastudio13.xml The Daily Telegraph, 2005-12-13
Art

Don Quixote in England (1731), Act III, scene xiv