صَحِيحُ مُسْلِمٍ
Sahih Muslim 1121 b
The Book of Fasting
The choice between fasting and not fasting when travelling
وَحَدَّثَنَا أَبُو الرَّبِيعِ الزَّهْرَانِيُّ، حَدَّثَنَا حَمَّادٌ، - وَهُوَ ابْنُ زَيْدٍ - حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، - رضى الله عنها - أَنَّ حَمْزَةَ بْنَ عَمْرٍو الأَسْلَمِيَّ، سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ يَا رَسُولَ اللَّهِ إِنِّي رَجُلٌ أَسْرُدُ الصَّوْمَ . أَفَأَصُومُ فِي السَّفَرِ قَالَ صُمْ إِنْ شِئْتَ وَأَفْطِرْ إِنْ شِئْتَ .
'A'isha (Allah be pleased with her) reported that Hamza b. Amr al-Aslami asked the Messenger of Allah (ﷺ) thus: Messenger of Allah, I am a person devoted much to fasting. Should I fast during the journey? He (the Prophet) said: Fast if you like and break it if you like.
Sahih Muslim, 1121 bSahihصحيح