The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1511
Salim b. 'Abdullah reported that his father had said: I saw the Messenger of Allah (may peace be upon him) delaying the sunset prayer till he would combine it with the 'Isha' when he hastened to set out on a journey.
Source materials are from the University of Southern California MSA site|
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