Abu Dawud Book 2, Hadith Number 427.
Chapter : Not known.
Narated By Umarah ibn Ruwaybah : A man from Basrah said: Tell me what you heard from the Apostle of Allah (PBUH). He said: I heard the Apostle of Allah (PBUH) say: No one will enter Hell who has prayed before the rising of the sun and before its setting (meaning the dawn and the afternoon prayers). He said three times: Have you heard it from him? He replied: Yes, each time saying: My ears heard it and my heart memorised it. The man then said: And I heard him (the Prophet) say that.