Attributed to Steve Jobs, apparently as a rallying "threat" during the amazing effort that went into shipping the system and software for the first Apple Macintosh (see anecdotes on Folklore.org).
The quote was used in the script of "Pirates of Silicon Valley".
The Folklore.org website contains a wealth of history and anecdotes recounting the lives, successes, failures, relationships, surroundings and other detail from the earliest days of Apple. Dan Kottke's posts recall the early hardware work on the Apple, Lisa and Mac projects, with photos of some of the early wire-wrapped prototype boards developed. Folklore.org
