It was in his book "how to get rich" or something similar to that title. Half memoir half advice. It's actually a pretty good read... title notwithstanding. I am not sure if he was he originator of that saying though.
The Audible version is extremely good. The narrator makes it sound like Monty Python, which seems to be an accurate tone for the book. It isn't a parody, but it's definitely irreverent and thoroughly entertaining.
One of the better books on wealth building I've read. Also very amuzing!
I don't think he coined the phrase, but his book is a strong read for sure.