Shortening the Prayers (At-Taqseer)
Bukhari :: Book 2 :: Volume 20 :: Hadith 212
Narrated Anas bin Malik:
Whenever the Prophet started a journey before noon, he used to delay the Zuhr prayer till the time of 'Asr and then offer them together; and if the sun declined (at noon) he used to offer the Zuhr prayer and then ride (for the journey).
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