حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ عَاصِمِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ لَوْ يَعْلَمُ أَحَدُكُمْ مَا فِي الْوَحْدَةِ مَا سَارَ أَحَدٌ بِلَيْلٍ وَحْدَهُ ‏"‏ ‏.‏

It was narrated from Ibn 'Umar that the Messenger of Allah(PBUH) said: "If anyone of you knew what is wrong with being alone, no one would travel at night by himself." Translation Not Available

Book Ref: Sunan Ibn Majah Book 33 Hadith 3768
Web Ref:  Sunan Ibn Majah Vol 5 Book 33 Hadith 3768