Language:
كتاب فرض الخمس
57  
One-fifth of Booty to the Cause of Allah (Khumus)
(3)
Chapter: The expenditure of the wives of the Prophet saws
(3)
باب نَفَقَةِ نِسَاءِ النَّبِيِّ صلى الله عليه وسلم بَعْدَ وَفَاتِهِ
Sahih al-Bukhari 3097

Narrated Aisha:

Allah's Messenger (ﷺ) died, and there was nothing in my house that a living being could eat, except some barley Lying on a shelf. So, I ate of it for a long period and measured it, and (after a short period) it was consumed.

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو أُسَامَةَ، حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ تُوُفِّيَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَمَا فِي بَيْتِي مِنْ شَىْءٍ يَأْكُلُهُ ذُو كَبِدٍ، إِلاَّ شَطْرُ شَعِيرٍ فِي رَفٍّ لِي، فَأَكَلْتُ مِنْهُ حَتَّى طَالَ عَلَىَّ، فَكِلْتُهُ فَفَنِيَ‏.‏
Reference : Sahih al-Bukhari 3097
In-book reference : Book 57, Hadith 6
USC-MSA web (English) reference : Vol. 4, Book 53, Hadith 329
  (deprecated numbering scheme)