‏الصلاة : Hadeeth No:737 Anas b. Malik reported: They (the Companions) discussed that they should know the timings of prayer by means of something recognized by all. Some of them said that fire should be lighted or a bell should be rung. But Bilal was ordered to repeat the phrases twice in Adhan, and once in Iqama....

‏الصلاة : Hadeeth No:934 Al-Bara' b. 'Azib reported that he said prayer with the Messenger of Allaah (sallAllaahu alayhi wa sallam) and he recited:" By the Fig and the Olive."...