Sahih Muslim Book - 13, Hadith - 2715

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ حَدَّثَنَا وَكِيعٌ عَنْ طَلْحَةَ بْنِ يَحْيَى عَنْ عَمَّتِهِ عَائِشَةَ بِنْتِ طَلْحَةَ عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ قَالَتْ دَخَلَ عَلَىَّ النَّبِىُّ -صلى الله عليه وسلم- ذَاتَ يَوْمٍ فَقَالَ « هَلْ عِنْدَكُمْ شَىْءٌ ». فَقُلْنَا لاَ. قَالَ « فَإِنِّى إِذًا صَائِمٌ ». ثُمَّ أَتَانَا يَوْمًا آخَرَ فَقُلْنَا يَا رَسُولَ اللَّهِ أُهْدِىَ لَنَا حَيْسٌ. فَقَالَ « أَرِينِيهِ فَلَقَدْ أَصْبَحْتُ صَائِمًا ». فَأَكَلَ.

It was narrated that ‘Aishah, the Mother of the Believers [may Allah be pleased with her] said: “The Prophet entered upon me one day and said: ‘Do you have anything (to eat)?’ We said: ‘No.’ He said: ‘Then I am fasting.’ Then he came to us on another day and we said: ‘O Messenger of Allah, we have been given some Hais.’ He said: ‘Show it to me, for I woke up this morning fasting,’ then he ate.”’