What was narrated concerning making fasting incumbent upon oneself from the night before, and having the choice (of breaking a voluntary fast) during the day Sunan Ibn Majah 1701

Arabic hadith text
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
Translation
It wasnarrated that ‘Aishah said

“The Messenger of Allah (ﷺ)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.”