What was the command of the Prophet Muhammad (saw) concerning Bilal's pronouncing of Adhan and Iqama?
 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 should be said twice).