ENOfficial
Nafi' said: Ibn 'Umar used to go out to al-Ghabah (jungle), but he neither broke his fast, nor shortened his prayer.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا الْمُعْتَمِرُ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، كَانَ يَخْرُجُ إِلَى الْغَابَةِ فَلاَ يُفْطِرُ وَلاَ يَقْصُرُ .
sunnah.com