"The Messenger of Allah said: There are two characteristics in which the Muslims are dependent upon their Mu'adh-dhins: their prayer and their fasting."
Sunan Ibn Majah Book 3, Hadith 7
← Previous Hadith "I came to the Messenger of Allah in Abtah, when he was in a red tent. Bilal came out and gave the call to prayer, turning around and putting his fingers in his ears."

Sunan Ibn Majah Book 3, Hadith 6 Next Hadith → "Bilal did not delay the Adhan from its proper time, but he sometimes delayed the Iqamah a little."

Sunan Ibn Majah Book 3, Hadith 8