"I feel able to fast while traveling; is there any sin on me?" He said: "It is a concession from Allah, the mighty and sublime, so whoever accepts it has done well, and whoever wants to fast, there is no sin on him." (Using translation from Nasāʾī 2303)  

أَنَّهُ قَالَ لِرَسُولِ اللهِ ﷺ أَجِدُ بِيَّ قُوَّةً عَلَى الصِّيَامِ فِي السَّفَرِ فَهَلْ عَلَيَّ جُنَاحٌ؟ قَالَ «هِيَ رُخْصَةٌ مِنَ اللهِ فَمَنْ أَخَذَ بِهَا فَحَسَنٌ وَمَنْ أَحَبَّ أَنْ يَصُومَ فَلَا جُنَاحَ عَلَيْهِ»  

"Should I fast while traveling?" He said: "If you wish then fast, and if you wish then do not fast." (Using translation from Nasāʾī 2304)  

أَنَّهُ سَأَلَ رَسُولَ اللهِ ﷺ أَصُومُ فِي السَّفَرِ؟ فَقَالَ «إِنْ شِئْتَ فَصُمْ وَإِنْ شِئْتَ فَأَفْطِرْ»