From the book, Hemingway Didn't Say That.

" 'Bud Crew says that a month ago he wrote this on the warehouse wall at Bud’s Tool Cribs in Richardson: “‘The way to do is to be.’ —Leo-tzu [sic], Chinese philosopher.”

A few days later, a salesman wrote under that: “‘The way to be is to do.’—Dale Carnegie.

Recently, says Crew, an anonymous sage has added still another axiom: “‘Do be, do be, do.’ —Frank Sinatra.”

Paul Crume’s Big D, Dallas Morning News, January 29, 1968, A1. Accessed in GenealogyBank.