The Book of Pilgrimage (Kitab Al-Hajj)

Muslim :: Book 7 : Hadith 3053

Abu Zubair reported: I asked Jabir (Allah be pleased with him) about riding on the sacrificial animal, to which he replied: I heard Allah's Apostle (may peace be upon him) as saying: Ride on them gently until you find another mount.

Source materials are from the University of Southern California MSA site
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