Sahih Bukhari
Wills and Testaments (Wasaayaa)
Volume: 004 / Book Number: 051 / Hadith Number: 32
Narrated Anas:
When the Prophet ordered that the mosque be built, he said, "O Bani An-Najjar! Suggest to me a price for this garden of yours." They replied, "By Allah! We will demand its price from none but Allah."