حَدَّثَنَا يَحْيَى بْنُ حَكِيمٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، وَابْنُ أَبِي عَدِيٍّ، عَنْ سُلَيْمَانَ التَّيْمِيِّ، عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ " لاَ يَمْنَعَنَّ أَحَدَكُمْ أَذَانُ بِلاَلٍ مِنْ سُحُورِهِ فَإِنَّهُ يُؤَذِّنُ لِيَنْتَبِهَ نَائِمُكُمْ وَلِيَرْجِعَ قَائِمُكُمْ وَلَيْسَ الْفَجْرُ أَنْ يَقُولَ هَكَذَا وَلَكِنْ هَكَذَا يَعْتَرِضُ فِي أَسْفَلِ السَّمَاءِ " .
It wasnarrated from ‘Abdullah bin Mas’ud that the Messenger of Allah(PBUH) said: “The Adhan of Bilal should not prevent anyone of youfromeating Suhur, for he gives the Adhan to alert those among youwho areasleep, and so that anyone who is praying can prepare himselfforfasting. The Fajr does not come in this manner, rather it comesinthis manner, and it appears along the horizon.” Translation Not Available
Book Ref: Sunan Ibn Majah Book 7 Hadith 1696
Web Ref: Sunan Ibn Majah Vol 1 Book 7 Hadith 1696