Sunan an-Nasa'i #1687 · The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day

Sunan an-Nasa'iIt was narrated from Nafi' that
Sunan an-Nasa'i · Book 20 · The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Sunan an-Nasa'i · كتاب 20 · كتاب قيام الليل وتطوع النهار
Ibn Umar used to pray witr on his camel and he mentioned that the Prophet (ﷺ) used to do that
أَخْبَرَنَا إِبْرَاهِيمُ بْنُ يَعْقُوبَ، قَالَ أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ عَلِيٍّ، قَالَ حَدَّثَنَا زُهَيْرٌ، عَنِ الْحَسَنِ بْنِ الْحُرِّ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، كَانَ يُوتِرُ عَلَى بَعِيرِهِ وَيَذْكُرُ أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَفْعَلُ ذَلِكَ ‏.‏
Reference : Sunan an-Nasa'i 1687In-book reference : Book 20, Hadith 90