Sahih al-Bukhari 48:1
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 48:1
In-book reference
Book 48, Hadith 1
Arabic Text
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.