The Book of Prayers (Kitab Al-Salat)

Muslim :: Book 4 : Hadith 1426

Malik b Huwairith reported: I came to the Apostle of Allah (may peace be upon him) along with a companion of mine, and when we intended to return from him, he said: When there is time for prayer, announce prayer, pronounce Iqama, and the oldest amongst you should lead the prayer.

Source materials are from the University of Southern California MSA site
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