Shortening the Prayers (At-Taqseer)
Bukhari :: Book 2 :: Volume 20 :: Hadith 195
Narrated Anas bin Malik :
offered four Rakat of Zuhr prayer with the Prophet (p.b.u.h) at Medina and two Rakat at Dhul-Hulaifa. (i.e. shortened the 'Asr prayer).
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