Ibn Abbas (may Allah be pleased with them both) said: The best of people came to me, among them Umar (may Allah be pleased with him), and the most approved of them in my view was Umar (may Allah be pleased with him). They stated that the Prophet (peace and blessings be upon him) forbade, or said: "There is no prayer after the Subh prayer until the sun rises, nor after Asr until the sun sets."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4369