The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1458
'A'isha, the wife of the Messenger of Allah (may peace be upon him), reported: The prayer was prescribed as two rak'abs, two rak'ahs both in journey and at the place of residence. The prayer while travelling remained as it was (originally prescribed), but an addition was made in the prayer (observed) at the place of residence.
Source materials are from the University of Southern California MSA site|
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