Ibn Umar used to travel out to al-Ghabah, yet he would neither break his fast nor shorten his prayer.
حدثنا مسدد حدثنا المعتمر عن عبيد الله
أن ابن عمر كان يخرج إلى الغابة فلا يفطر ولا يقصر
No references are available.
[Its chain of transmission is sahih]. Bayhaqi narrated it: 4/241, from the hadith of Abu Dawud, through this same chain.