Nasr bin Abdur-Rahman narrates from his grandfather Mu'adh - a man from Banu Taym - that he was performing tawaf after Asr with Sayyiduna Mu'adh bin Afra' (may Allah be pleased with him), and he did not pray. So I asked: "What prevented you from praying?" He said: "The Prophet (peace and blessings be upon him) forbade praying at two times: after Fajr until the sun rises, and after Asr until the sun sets."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17514