Sahih Bukhari
Mortgaging
Volume: 003 / Book Number: 045 / Hadith Number: 685
Narrated Anas:
No doubt, the Prophet mortgaged his armor for barley grams. Once I took barley bread with some dissolved fat on it to the Prophet and I heard him saying, "The household of Muhammad did not possess except a Sa (of food grain, barley, etc.) for both the morning and the evening meals although they were nine houses."