Mortgaging
Bukhari :: Book 3 :: Volume 45 :: Hadith 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."