حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا أَبُو دَاوُدَ، حَدَّثَنَا شَرِيكٌ، عَنْ سِمَاكِ بْنِ حَرْبٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، قَالَ كَانَ بِلاَلٌ لاَ يُؤَخِّرُ الأَذَانَ عَنِ الْوَقْتِ وَرُبُّمَا أَخَّرَ الإِقَامَةَ شَيْئًا ‏.‏

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." Translation Not Available

Book Ref: Sunan Ibn Majah Book 3 Hadith 713
Web Ref:  Sunan Ibn Majah Vol 1 Book 3 Hadith 713