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.
nasai:641Isḥāq b. Ibrāhīm > al-Muʿtamir b. Sulaymān from his father > Abū ʿUthmān > Ibn Masʿūd

"Bilal calls the Adhan during the night to wake those who are sleeping and so that those who are praying Qiyam can return.[1] Not to say it is like this." The break of dawn is not like this. [2] [1] Meaning to finish. Ash-Shawkani said: "To return to sleeping or return to sitting from praying" Nail Al-Awtar. [2] Indicating with an up and down motion. The true dawn is from right to left.  

النسائي:٦٤١أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ قَالَ أَنْبَأَنَا الْمُعْتَمِرُ بْنُ سُلَيْمَانَ عَنْ أَبِيهِ عَنْ أَبِي عُثْمَانَ عَنِ ابْنِ مَسْعُودٍ

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ بِلاَلاً يُؤَذِّنُ بِلَيْلٍ لِيُوقِظَ نَائِمَكُمْ وَلِيَرْجِعَ قَائِمَكُمْ وَلَيْسَ أَنْ يَقُولَ هَكَذَا يَعْنِي فِي الصُّبْحِ  


See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:1617Isḥāq b. Ibrāhīm > al-Muʿtamir b. Sulaymān from his father > Abū ʿUthmān > Ibn Masʿūd

"Bilal calls the Adhan during the night to wake those who are sleeping and so that those who are praying Qiyam can return.[1] Not to say it is like this." The break of dawn is not like this. [2] [1] Meaning to finish. Ash-Shawkani said: "To return to sleeping or return to sitting from praying" Nail Al-Awtar. [2] Indicating with an up and down motion. The true dawn is from right to left. (Using translation from Nasāʾī 641)  

الكبرى للنسائي:١٦١٧أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ قَالَ أَخْبَرَنَا المُعْتَمِرُ بْنُ سُلَيْمَانَ عَنْ أَبِيهِ عَنْ أَبِي عُثْمَانَ عَنِ ابْنِ مَسْعُودٍ

عَنِ النَّبِيِّ ﷺ قَالَ «إِنَّ بِلَالًا يُؤَذِّنُ بِلَيْلٍ لِيُوقِظَ نَائِمَكُمْ وَلِيَرْجِعَ قَائِمَكُمْ وَلَيْسَ أَنْ يَقُولَ هَكَذَا يَعْنِي الصُّبْحَ»