Abu Dawud
Prayer
Book Number: 002 / Hadith Number: 1271
Narated By Abdullah ibn Abbas : Some reliable people testified before me, and among them was Umar ibn al-Khattab, and most reliable in my eyes was Umar: The Prophet of Allah (pbuh) said: There is no prayer after the dawn prayer until the sun rises; and there is no prayer after the afternoon prayer until the sun sets.