Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnmajah:713Muḥammad b. al-Muthanná > Abū Dāwud > Sharīk > Simāk b. Ḥarb > Jābir b. Samurah

"Bilal did not delay the Adhan from its proper time, but he sometimes delayed the Iqamah a little."  

ابن ماجة:٧١٣حَدَّثَنَا 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