"An unexamined life is not worth living"

Does anyone know where this quote came from and who said it?

Socrates (470-399 BC) said it.

I beg to differ. According to Bartlett's Familiar Quotations, by John Barlett and Justin Kaplan, general editor (Little, Brown and Co., Boston, 2002):

The life which is unexamined is not worth living. "Apology." Plato (c. 428 - 348 B.C.)

It is *quoted* in Plato's "Apology [of Socrates]."

From "The Oxford Dictionary of Quotations, 5th Ed" :

Socrates 469-399 BC
The unexamined life is not worth living.
Plato [tr. Lane Cooper] _Apology_ 42a

Dueling quote books!!