I didn't find it as a quote, per se...
“And the exhortation to lead by example, a very traditional piece of advice given to up-and-coming managers”http://hallbusinesses.com/biographies_primers/791.shtml
But if Hunt's been conservative about what government should do, he's never been the least bit conservative about what he as governor should do. He should lead by example and by exhortation, and he should do it all-out, every day, and in every way he and his staff can think of.http://www.indyweek.com/durham/2000-12-13/cover.html
Character Builders Lead by Example, Not by Exhortation http://www.corwinpress.com/booktoc.aspx?pid=9350&sc=1
…on the pressing problems of world poverty and globalization, we believe that the Church's frequent calls to affluent nations to work towards a more equitable distribution of wealth and resources would carry more weight if the Church itself gave a lead by example as well as by exhortation. http://www.shadow-synod.net/other_projects/cffc_letter_may2001.htm
Peter exhorted leaders in 1 Peter 5:1-3, saying, “Therefore, I exhort the elders… shepherd the flock of God among you, exercising oversight not under compulsion, but voluntarily, according to the will of God; and not for sordid gain, but with eagerness; nor yet as lording it over those allotted to your charge, but proving to be examples to the flock.
” The word for “lording over” means to subdue, overcome, and hold in subjection. Peter’s admonition clearly and intrepidly exposes and reproves the deeds of the people conquerors. Leadership is through example, and not by lording it over people. http://www.richharvest.org/Deeds.htm