The Book of Prayers (Kitab Al-Salat)

Muslim :: Book 4 : Hadith 1469

Anas reported: The Messenger of Allah (may peace be upon him) said four rak'ahs in the noon prayer while at Medina, but he offered two rak'ahs in the afternoon prayer at Dhu'l-Hulaifa.

Source materials are from the University of Southern California MSA site
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