Sahih Bukhari, Chapter: Times of the Prayers

Allah's Apostle forbade two kinds of sales, two kinds of dresses, and two prayers. He forbade offering prayers after the Fajr prayer till the rising of the sun and after the 'Asr prayer till its setting. He also forbade "Ishtimal-Assama" and "al-Ihtiba" in one garment in such a way that one's private parts are exposed towards the sky. He also forbade the sales called "Munabadha" and "Mulamasa." (See Hadith No. 354 and 355 Vol. 3).