حَدَّثَنَا إِسْمَاعِيلُ بْنُ مُوسَى، حَدَّثَنَا شَرِيكٌ، عَنْ طَلْحَةَ بْنِ يَحْيَى، عَنْ مُجَاهِدٍ، عَنْ عَائِشَةَ، قَالَتْ دَخَلَ عَلَىَّ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ فَقَالَ ‏"‏ هَلْ عِنْدَكُمْ شَىْءٌ ‏"‏ ‏.‏ فَنَقُولُ لاَ ‏.‏ فَيَقُولُ ‏"‏ إِنِّي صَائِمٌ ‏"‏ ‏.‏ فَيُقِيمُ عَلَى صَوْمِهِ ثُمَّ يُهْدَى لَنَا شَىْءٌ فَيُفْطِرُ ‏.‏ قَالَتْ وَرُبَّمَا صَامَ وَأَفْطَرَ ‏.‏ قُلْتُ كَيْفَ ذَا قَالَتْ إِنَّمَا مَثَلُ هَذَا مَثَلُ الَّذِي يَخْرُجُ بِصَدَقَةٍ فَيُعْطِي بَعْضَهَا وَيُمْسِكُ بَعْضًا ‏.‏

It wasnarrated that ‘Aishah said: “The Messenger of Allah (PBUH)wouldenter upon me and say: ‘Do you have anything (any food)?’ If wesaid: ‘No,’ he would say: ‘Then I am fasting.’ So he wouldcontinuefasting, then it we were given some food, he would break hisfast.”She said: “Sometimes he would fast and (then) break fast(i.e.,combine fasting and breaking fast in one day).” I said: “Howis that?”She said: “Like the one who goes out with charity(i.e., something togive in charity),and he gives some away and keepssome.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 7 Hadith 1701
Web Ref:  Sunan Ibn Majah Vol 1 Book 7 Hadith 1701