Sahih Bukhari
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Volume: 003 / Book Number: 034 / Hadith Number: 283
Narrated Qatada:
Anas went to the Prophet with barley bread having some dissolved fat on it. The Prophet had mortgaged his armor to a Jew in Medina and took from him some barley for his family. Anas heard him saying, "The household of Muhammad did not possess even a single Sa of wheat or food grains for the evening meal, although he has nine wives to look after." (See Hadith No. 685)