Wills and Testaments (Wasaayaa)
Bukhari :: Book 4 :: Volume 51 :: Hadith 35
Narrated Anas bin Malik:
When Allah's Apostle came to Medina, he ordered that a mosque be built. He said, "O Bani An-Najjar! Suggest me a price for the garden of yours." They replied, "By Allah, we will not ask its price except from Allah."