حَدَّثَنَا يَحْيَى بْنُ آدَمَ حَدَّثَنَا مُفَضَّلٌ عَنْ مَنْصُورٍ عَنْ مُجَاهِدٍ عَنْ طَاوُسٍ عَنِ ابْنِ عَبَّاسٍ قَالَ سَافَرَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَامَ الْفَتْحِ فِي رَمَضَانَ فَصَامَ حَتَّى بَلَغَ عُسْفَانَ ثُمَّ دَعَا بِإِنَاءٍ فَشَرِبَ نَهَارًا لِيَرَاهُ النَّاسُ ثُمَّ أَفْطَرَ حَتَّى دَخَلَ مَكَّةَ وَافْتَتَحَ مَكَّةَ فِي رَمَضَانَ قَالَ ابْنُ عَبَّاسٍ فَصَامَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي السَّفَرِ وَأَفْطَرَ فَمَنْ شَاءَ صَامَ وَمَنْ شَاءَ أَفْطَرَ
مسند امام احمد بن حنبل · Hadith 2995
It was narrated that Ibn 'Abbas (RA) said: The Messenger of Allah (PBUH) travelled in Ramadan during the year of the conquest. He fasted until he reached 'Usfan, then he called for a vessel and drank during the day so that the people would see him. Then he did not fast until he entered Makkah, and he conquered Makkah in Ramadan. Ibn 'Abbas said: So the Messenger of Allah (PBUH) fasted whilst travelling and did not fast. So whoever wants to may fast and whoever wants to may not fast.
Sanad
حَدَّثَنَا يَحْيَى بْنُ آدَمَ حَدَّثَنَا مُفَضَّلٌ عَنْ مَنْصُورٍ عَنْ مُجَاهِدٍ عَنْ طَاوُسٍ عَنِ ابْنِ عَبَّاسٍ