Prayer (Kitab Al-Salat)
Dawud :: Book 2 : Hadith 498
Narrated AbuUmayr ibn Anas:
AbuUmayr reported on the authority of his uncle who was from the Ansar (the helpers of the Prophet): The Prophet (peace_be_upon_him) was anxious as to how to gather the people for prayer.
The people told him: Hoist a flag at the time of prayer; when they see it, they will inform one another. But he (the Prophet) did not like it. Then someone mentioned to him the horn.
Ziyad said: A horn of the Jews. He (the Prophet) did not like it. He said: This is the matter of the Jews. Then they mentioned to him the bell of the Christians. He said: This is the matter of the Christians. Abdullah ibn Zayd returned anxiously from there because of the anxiety of the Apostle (peace_be_upon_him). He was then taught the call to prayer in his dream. Next day he came to the Apostle of Allah (peace_be_upon_him) and informed him about it.
He said: Apostle of Allah, I was between sleep and wakefulness; all of a sudden a newcomer came (to me) and taught me the call to prayer. Umar ibn al-Khattab had also seen it in his dream before, but he kept it hidden for twenty days.
The Prophet (peace_be_upon_him) said to me (Umar): What did prevent you from saying it to me?
He said: Abdullah ibn Zayd had already told you about it before me: hence I was ashamed.
Then the Apostle of Allah (peace_be_upon_him) said: Bilal, stand up, see what Abdullah ibn Zayd tells you (to do), then do it. Bilal then called them to prayer.
AbuBishr reported on the authority of AbuUmayr: The Ansar thought that if Abdullah ibn Zayd had not been ill on that day, the Apostle of Allah (peace_be_upon_him) would have made him mu'adhdhin.