Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: Of the people who narrated to me, Sayyiduna Umar (may Allah be pleased with him) was the dearest to me. They stated that the Prophet (peace and blessings be upon him) said: "There is no prayer after Fajr until the sun rises, nor after Asr until the sun sets."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4370