Hadith 14:102
Sahih Mauquf (Al-Albani)
Nafi' said:
Ibn 'Umar used to go out to al-Ghabah (jungle), but he neither broke his fast, nor shortened his prayer.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا الْمُعْتَمِرُ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، كَانَ يَخْرُجُ إِلَى الْغَابَةِ فَلاَ يُفْطِرُ وَلاَ يَقْصُرُ
Original Reference: Sunan Abi Dawud 2414