the Messenger of Allah saw some people gathered around a man, so he asked (what was happening) and they said: "It is a man who is exhausted because of fasting." The Messenger of Allah said: "It is not righteousness to fast when traveling."  

أَنَّ رَسُولَ اللَّهِ ﷺ رَأَى نَاسًا مُجْتَمِعِينَ عَلَى رَجُلٍ فَسَأَلَ فَقَالُوا رَجُلٌ أَجْهَدَهُ الصَّوْمُ قَالَ رَسُولُ اللَّهِ ﷺ لَيْسَ مِنَ الْبِرِّ الصِّيَامُ فِي السَّفَرِ  

the Messenger of Allah passed by a man in the shade of a tree on whom water was being sprinkled. He said: "What is the matter with your companion?" They said: "O Messenger of Allah, he is fasting." He said: "It is not righteousness to fast when traveling. Take to the concession which Allah has granted you, accept it."  

أَنَّ رَسُولَ اللَّهِ ﷺ مَرَّ بِرَجُلٍ فِي ظِلِّ شَجَرَةٍ يُرَشُّ عَلَيْهِ الْمَاءُ قَالَ مَا بَالُ صَاحِبِكُمْ هَذَا قَالُوا يَا رَسُولَ اللَّهِ صَائِمٌ قَالَ إِنَّهُ لَيْسَ مِنَ الْبِرِّ أَنْ تَصُومُوا فِي السَّفَرِ وَعَلَيْكُمْ بِرُخْصَةِ اللَّهِ الَّتِي رَخَّصَ لَكُمْ فَاقْبَلُوهَا  

"Someone who heard it from Jabir told me something similar."  

سَمِعَ جَابِرًا نَحْوَهُ