Sahih Bukhari
Sahih Bukhari Volume 005, Book 058, Hadith Number 149.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 58. Merits of the Helpers in Madina (Ansaar)
Narated By Anas : Two men left the Prophet on a very dark night. Suddenly a light came in front of them, and when they separated, the light also separated along with them.