Sunan an-Nasa'i #3821 · The Book of Agriculture

Sunan an-Nasa'iIt was narrated that Ibn 'Umar said
Sunan an-Nasa'i · Book 35 · The Book of Agriculture
Sunan an-Nasa'i · كتاب 35 · كتاب المزارعة
"Umar had made a vow to spend a night in 'Itikaf in Al-Masjid Al-Haram. He asked the Messenger of Allah about that, and he ordered him to perform the 'Itikaf
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ يَزِيدَ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ كَانَ عَلَى عُمَرَ نَذْرٌ فِي اعْتِكَافِ لَيْلَةٍ فِي الْمَسْجِدِ الْحَرَامِ فَسَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ ذَلِكَ فَأَمَرَهُ أَنْ يَعْتَكِفَ ‏.‏
Reference : Sunan an-Nasa'i 3821In-book reference : Book 35, Hadith 61