(3) باب السُّنَّةِ فِي الأَذَانِ
'Abdur-Rahman bin Sa'd bin 'Ammar bin Sa'd, who was the Mu'adh-dhin of the Messenger of Allah narrated from his grandfather, that:
The Messenger of Allah commanded Bilal to put his fingers in his ears when calling the Adhan, and he said: "It makes the voice louder." (FR)
Reference (FR): Sunan Ibn Majah 710 (FR)
In-book reference (FR): Book 3, Hadith 5 (FR)
English translation (FR): Vol. 1, Book 3, Hadith 710 (FR)