"fool me once shame on.."?

Question:what is the rest of that quote. and who said it? please help



Answers:
you; fool me twice, shame on me.

Here's what I found on The Phrase finder:
FOOL ME ONCE, SHAME ON YOU; FOOL ME TWICE, SHAME ON ME - "Anyone who falls for the same deceit twice must accept responsibility for his own gullibility; thus, one should be more watchful the next time around. Originally a child's saying." From the "Random House Dictionary of Popular Proverbs and Sayings" by Gregory Y. Titelman (Random House, New York, 1996).
"fool me once shame on you...fool me twice shame on me."
but i have no idea who sais it...sorry
shame on you fool me twice shame on me.

Robert Deniro in Taxi Driver

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