Abu Dawud
Prayer
Book Number: 002 / Hadith Number: 530
Narated By Umm Salamah, Ummul Mu'minin : The Apostle of Allah (pbuh) taught me to say when the adhan for the sunset prayer was called; "O Allah, this is the time when Thy night comes on, Thy day retires, and the voices of Thy summoners are heard, so forgive me."