‏الصلاة : Hadeeth No:735 Ibn Umar reported: When the Muslims came to Medina, they gathered and sought to know the time of prayer but no one summoned them. One day they discussed the matter, and some of them said: Use something like the bell of the Christians and some of them said: Use horn like that of the Jews. Umar said: ...

‏البر والصلة والآداب‏ : Hadeeth No:6387 Abu Musa, reported that a person came to Allaah's Messenger (sallAllaahu alayhi wa sallam) ; the rest of the hadith is the same....