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.
Hadith Referenceسنن ابي داود / كتاب الصيام / 2365
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح, مشكوة المصابيح (2011), ولبعض الحديث شاھد عند مسلم (1114)
Hadith Takhrij« تفرد بہ أبوداود، (تحفة الأشراف: 15688)، وقد أخرجہ: موطا امام مالک/الصیام 7 (2)، مسند احمد (3/475، 4/63، 5/376، 380، 408، 430) (صحیح) »
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