Sahih Bukhari Volume 003, Book 035, Hadith Number 454.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 35. Sales in Which a Price is paid for Goods to be Delivered later (As-Salam)
Narated By Al-A'mash : We argued at Ibrahim's dwelling place about mortgaging in Salam. He said, "'Aisha said, 'The Prophet bought some foodstuff from a Jew on credit and the payment was to be made by a definite period, and he mortgaged his iron armor to him."