Merits of the Helpers in Madinah (Ansaar)

Bukhari :: Book 5 :: Volume 58 :: Hadith 199

Narrated 'Abdur-Rahman:

"I asked Masruq, 'Who informed the Prophet about the Jinns at the night when they heard the Qur'an?' He said, 'Your father 'Abdullah informed me that a tree informed the Prophet about them.' "