Sahih Bukhari
Wills and Testaments (Wasaayaa)
Volume: 004 / Book Number: 051 / Hadith Number: 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."