(3) باب السُّنَّةِ فِي الأَذَانِ
It was narrated that Jabir bin Samurah said:
"Bilal did not delay the Adhan from its proper time, but he sometimes delayed the Iqamah a little." (ES)
Reference (ES): Sunan Ibn Majah 713 (ES)
In-book reference (ES): Book 3, Hadith 8 (ES)
English translation (ES): Vol. 1, Book 3, Hadith 713 (ES)