Jami` at-Tirmidhi 1673
جامع الترمذي#1673SahihNarrated Ibn 'Umar:That the Messenger of Allah (ﷺ) said: "If the people knew what I know about being alone, then a rider would not journey at night." - meaning alone
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 23:4