Sunan Ibn Majah, Book 7, Hadith 1730 (In-Book) ⓘ
It was narrated that Ibn ‘Abbas said: “The Messenger of Allah fasted while he was traveling, and he broke his fast.”
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ مَنْصُورٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ صَامَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ فِي السَّفَرِ وَأَفْطَرَ .
also referenced under: Hadith 1661 (Reference) & Volume 2, Book 7, Hadith 1661 (DarusSalam)