´It was narrated that Al-'Awwam bin Hawshab said:` "I said to Mujahid: 'What about fasting while traveling?' He said: 'The Messenger of Allah used to fast (sometimes) and not fast (sometimes)."'
Hadith Referenceسنن نسائي / كتاب الصيام / 2294
Hadith Gradingالألبانی:صحيح لغيره | زبیر علی زئی:حسن
Hadith Takhrij«انظر حدیث رقم: 2292 (صحیح) (اس کے راوی عوام ضعیف ہیں، لیکن اگلی سند سے تقویت پاکر یہ صحیح ہے)»
Narrated A Companion of the Prophet: Abu Bakr ibn Abdur Rahman reported on the authority of a Companion of the Prophet ﷺ: I saw the Prophet ﷺ commanding the people while he was travelling on the occasion of the conquest of Makkah not to observe fast. He said: Be strong for your enemy. The Messenger of Allah ﷺ fasted himself. Narrated Abu Bakr: A man who narrated his tradition to me said: I have seen the Messenger of Allah ﷺ in al-Arj pouring water over his head while he was fasting, either because of thirst or because of heat.
Shaykh Umar Farooq Saeedi
Benefits and Issues: ➊ Breaking the fast during travel or jihad is more virtuous.
➋ It is also permissible to keep the fast while traveling.
➌ In the discomfort of heat or thirst, it is permissible to pour water over one’s head or body, to perform ritual bath (ghusl), or to wrap oneself in a wet cloth. Similarly, it is also permissible to benefit from air conditioning.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2365