Wills and Testaments (Wasaayaa)

Bukhari :: Book 4 :: Volume 51 :: Hadith 6

Narrated Ibn 'Abbas:

I recommend that people reduce the proportion of what they bequeath by will to the fourth (of the whole legacy), for Allah's Apostle said, "One-third, yet even one third is too much."

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star