Sahih Bukhari Volume 004, Book 051, Hadith Number 039.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 51. Wills and Testaments (Wasaayaa)
Narated By Anas : The Prophet said (at the time of building the Mosque), "O Ban, An-Najjar! Suggest to me a price for your garden." They replied, "We do not ask its price except from Allah."