Sahih Bukhari Volume 3, Book 48, Hadith 2509

حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا هِشَامٌ، حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ وَلَقَدْ رَهَنَ النَّبِيُّ صلى الله عليه وسلم دِرْعَهُ بِشَعِيرٍ، وَمَشَيْتُ إِلَى النَّبِيِّ صلى الله عليه وسلم بِخُبْزِ شَعِيرٍ وَإِهَالَةٍ سَنِخَةٍ، وَلَقَدْ سَمِعْتُهُ يَقُولُ ‏"‏ مَا أَصْبَحَ لآلِ مُحَمَّدٍ صلى الله عليه وسلم إِلاَّ صَاعٌ، وَلاَ أَمْسَى ‏"‏‏.‏ وَإِنَّهُمْ لَتِسْعَةُ أَبْيَاتٍ‏

Narrated By Anas : No doubt, the Prophet mortgaged his armour 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."