Narrated Adi bin Hatim: When the verse Until the white thread of dawn appear to you distinct from its black thread was revealed, I took a white rope and a black rope, and placed them beneath my pillow ; and then I looked at them, byt they were not clear to me. So I mentioned it to the Messenger of Allah صلی اللہ علیہ وسلم. He laughed and said: Your pillow is so broad and lengthy ; that is (i. e. means) night and day. The version of the narrator Uthman has: That is the blackness of night and whiteness of day.