[Avodah] Phantom Maamar Chazal?

[Arie Folger]

Rabosai,

What is the earliest source of yesh lo maneh rotzeh matayim? After failing to 
find it in Bavli and Yerushalkmi, I googled, found the phrase widely quoted, 
but found no attribution. The one attribution I found (Midrash Qohelet 1:13) 
didn't seem correct. Is this a Phantom Maamar Chazal (tm)?
-- 
Arie Folger
http://ariefolger.wordpress.com
http://www.ariefolger.googlepages.com