Sunan an-Nasa'i, Volume 3, Book 22, Hadith 2271 (DarusSalam) ⓘ
It was narrated that Abu Umayyah Ad-Damri said: "I came to the Messenger of Allah from a journey and greeted him with Salam. When I was going to leave he said: 'Stay and have meal for breakfast, O Abu Umayyah.' I said: 'I am fasting, O Prophet of Allah.' He said: 'Come and I will tell about the traveler. Allah, most high, has waived fasting and of the prayer for him."'
أَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ أَنْبَأَنَا أَبُو الْمُغِيرَةِ، قَالَ حَدَّثَنَا الأَوْزَاعِيُّ، عَنْ يَحْيَى، عَنْ أَبِي قِلاَبَةَ، عَنْ أَبِي الْمُهَاجِرِ، عَنْ أَبِي أُمَيَّةَ الضَّمْرِيِّ، قَالَ قَدِمْتُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم مِنْ سَفَرٍ فَسَلَّمْتُ عَلَيْهِ فَلَمَّا ذَهَبْتُ لأَخْرُجَ قَالَ " انْتَظِرِ الْغَدَاءَ يَا أَبَا أُمَيَّةَ " . قُلْتُ إِنِّي صَائِمٌ يَا نَبِيَّ اللَّهِ . قَالَ " تَعَالَ أُخْبِرْكَ عَنِ الْمُسَافِرِ إِنَّ اللَّهَ تَعَالَى وَضَعَ عَنْهُ الصِّيَامَ وَنِصْفَ الصَّلاَةِ " .
also referenced under: Hadith 2269 (Reference) & Book 22, Hadith 180 (In-Book)