Abu Dawud
Dialects And Readings Of The Quran
Book Number: 025 / Hadith Number: 3991
Narated By Abu Dharr : I was sitting behind the Apostle of Allah (pbuh) who was riding a donkey while the sun was setting. He asked: Do you know where it sets? I replied: Allah and his Apostle know best. He said: It sets in a spring of warm water (hamiyah).