Sahih Muslim 2970
Sahih Muslim · Book 55: The Book of Zuhd and Softening of Hearts
'A'isha reported:
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا حَفْصُ بْنُ غِيَاثٍ ، عَنْ هِشَامِ بْنِ عُرْوَةَ ، عَنْ أَبِيهِ ، قَالَ قَالَتْ عَائِشَةُ مَا شَبِعَ آلُ مُحَمَّدٍ صلى الله عليه وسلم مِنْ خُبْزِ الْبُرِّ ثَلاَثًا حَتَّى مَضَى لِسَبِيلِهِ .
Never could the family of Muhammad (may peace. be upon him) (afford to eat) the bread of wheat for three (successive days) until he ran the course of his life.