Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) forbade "prayers at two times: after Fajr until the sun rises, and after Asr until the sun sets."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4372