صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب الأذان - ذكر البيان بأن قول أنس أمر بلال أراد به رسول الله صلى الله عليه وسلم دون غيره
Chapter on Adhan - Clarification that Anas’s statement "Bilal was ordered" refers to the Prophet’s command.
1 hadith
Hadith 1676
Sayyiduna Anas (may Allah be pleased with him) narrates: The Messenger of Allah ordered Sayyiduna Bilal (may Allah be pleased with him) to say the words of the adhan in even numbers and the words of the iqamah in odd numbers.