Messenger of Allah, I am a person devoted much to fasting. Should I fast during the journey? He (the Holy Prophet) said: Fast if you like and break it if you like. (Using translation from Muslim 1121b)  

أَنَّ حَمْزَةَ بْنَ عَمْرٍو الْأَسْلَمِيَّ سَأَلَ النَّبِيَّ ﷺ يَا رَسُولَ اللهِ إِنِّي رَجُلٌ أَسْرُدُ الصَّوْمَ أَفَأَصُومُ فِي السَّفَرِ قَالَ «صُمْ إِنْ شِئْتَ أَوْ أَفْطِرْ إِنْ شِئْتَ»