Sahih Bukhari
607
Narrated Abu Qilaba: Anas said, Bilal was ordered to pronounce the wording of Adhan twice and of Iqama once only. The sub narrator Isma`il said, I mentioned that to Aiyub and he added (to that), Except Iqama (i.e. Qadqamat- is-salat which..
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