صحيح البخاري Sahih Bukhari كتاب الصوم The Book of As-Saum (The Fasting).
بَابُ إِذَا صَامَ أَيَّامًا مِنْ رَمَضَانَ ثُمَّ سَافَرَ:

(34) Chapter. If a person observed Saum (fast) some days of Ramadan and then went on a journey (is it permissible for him to break his Saum).

1 hadith
Hadith 1944
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ ، أَخْبَرَنَا مَالِكٌ ، عَنِ ابْنِ شِهَابٍ ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ ، عَنْ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُ ، أَنّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ خَرَجَ إِلَى مَكَّةَ فِي رَمَضَانَ ، فَصَامَ حَتَّى بَلَغَ الْكَدِيدَ ، أَفْطَرَ فَأَفْطَرَ النَّاسُ " ، قَالَ أَبُو عَبْد اللَّهِ : وَالْكَدِيدُ مَاءٌ بَيْنَ عُسْفَانَ ، وَقُدَيْدٍ .
Narrated Ibn `Abbas: Allah's Apostle set out for Mecca in Ramadan and he fasted, and when he reached Al-Kadid, he broke his fast and the people (with him) broke their fast too. (Abu `Abdullah said, "Al-Kadid is a land covered with water between Usfan and Qudaid.")
Hadith Reference Sahih Bukhari / The Book of As-Saum (The Fasting). / Hadith: 1944
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة