(1) باب فِي الرَّهْنِ فِي الْحَضَرِ
Narrated Anas:
No doubt, the Prophet (ﷺ) mortgaged his armor for barley grams. Once I took barley bread with some dissolved fat on it to the Prophet (ﷺ) 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."
Reference: Sahih al-Bukhari 2508
In-book reference: Book 48, Hadith 1
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 45, Hadith 685