"It is not righteousness to fast when traveling. Take to the concession which Allah, the mighty and sublime, has granted you, accept it." (Using translation from Nasāʾī 2260)  

عَنْ رَسُولِ اللهِ ﷺ قَالَ «لَيْسَ مِنَ الْبِرِّ الصِّيَامُ فِي السَّفَرِ عَلَيْكُمْ بِرُخْصَةِ اللهِ فَاقْبَلُوهَا»  

‘It is not an act of righteousness to fast while traveling.” (Using translation from Ibn Mājah 1664)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَيْسَ مِنَ الْبِرِّ الصِّيَامُ فِي السَّفَرِ»