The Book of the Masjids
8/29. Chapter:
Sleeping In The Masjid
Sunan an-Nasai
أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، أَنَّهُ كَانَ يَنَامُ وَهُوَ شَابٌّ عَزْبٌ لاَ أَهْلَ لَهُ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي مَسْجِدِ النَّبِيِّ صلى الله عليه وسلم .
It was narrated from Ibn 'Umar, that when he was young and single, with no family, at the time of the Messenger of Allah (ﷺ), he used to sleep in the Masjid of the Prophet (ﷺ).
Reference : Sunan an-Nasa'i 722In-book reference : Book 8, Hadith 35English translation : Vol. 1, Book 8, Hadith 723