Sunan an-Nasa'i, Volume 3, Book 22, Hadith 2284 (DarusSalam) ⓘ

It was narrated that Ghalian said: "I went out with Abu Qilabah on a journey and he brought some food. I said: 'I am fasting.' He said: 'The Messenger of Allah went out on a journey and brought some food, and said to a man: Come and eat. He said: I am fasting. He said: Allah has waived for the traveler half of the prayer and fasting when traveling, so come and eat. So I came close and ate."'

أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، قَالَ أَنْبَأَنَا إِسْرَائِيلُ، عَنْ مُوسَى، - هُوَ ابْنُ أَبِي عَائِشَةَ - عَنْ غَيْلاَنَ، قَالَ خَرَجْتُ مَعَ أَبِي قِلاَبَةَ فِي سَفَرٍ فَقَرَّبَ طَعَامًا فَقُلْتُ إِنِّي صَائِمٌ ‏.‏ فَقَالَ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم خَرَجَ فِي سَفَرٍ فَقَرَّبَ طَعَامًا فَقَالَ لِرَجُلٍ ‏"‏ ادْنُ فَاطْعَمْ ‏"‏ ‏.‏ قَالَ إِنِّي صَائِمٌ ‏.‏ قَالَ ‏"‏ إِنَّ اللَّهَ وَضَعَ عَنِ الْمُسَافِرِ نِصْفَ الصَّلاَةِ وَالصِّيَامَ فِي السَّفَرِ ‏"‏ ‏.‏ فَادْنُ فَاطْعَمْ فَدَنَوْتُ فَطَعِمْتُ ‏.‏