Narrated `Umar: "The Prophet forbade praying after the Fajr prayer till the sun rises and after the `Asr prayer till the sun sets." Narrated Ibn `Abbas: Some people told me the same narration (as above).
Hadith ReferenceSahih Bukhari / The Book of The Times of As-Salat (The Prayers) and Its Superiority / Hadith: 581
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة