حَدَّثَنَا إِسْمَاعِيلُ عَنْ سُلَيْمَانَ عَنْ أَبِي عُثْمَانَ عَنْ ابْنِ مَسْعُودٍ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا يَمْنَعَنَّ أَحَدَكُمْ أَذَانُ بِلَالٍ أَوْ قَالَ نِدَاءُ بِلَالٍ مِنْ سَحُورِهِ فَإِنَّهُ يُؤَذِّنُ أَوْ قَالَ يُنَادِي لِيَرْجِعَ قَائِمَكُمْ وَلِيُنَبِّهَ نَائِمَكُمْ ثُمَّ لَيْسَ أَنْ يَقُولَ هَكَذَا أَوْ قَالَ هَكَذَا حَتَّى يَقُولَ هَكَذَا
مسند امام احمد بن حنبل · Hadith 4147
It was narrated that Ibn Mas'ood (RA) said; The Messenger of Allah said; "None of you should let the adhan of Bilal keep him from his sahoor, because he gives the adhan so that those of you who are praying qiyani may go back (to rest), and those of you who are asleep should wake up. It is not when it is like this"- and he put his fingers together and raised (his hand - to indicate vertical) - "rather it is until it is like this"- and Yahya spread his forefingers apart (to indicate horizontal).
Sanad
حَدَّثَنَا إِسْمَاعِيلُ عَنْ سُلَيْمَانَ عَنْ أَبِي عُثْمَانَ عَنْ ابْنِ مَسْعُودٍ