ENOfficial
Samura b. Jundub reported God’s Messenger as saying, “Do not let Bilal’s adhan or the false dawn prevent you from taking your morning meal , but only the dawn which is widely spread in the horizon.” Muslim transmitted it, but the wording is Tirmidhi’s.
Source: sunnah.com
Other translations
Arabic
وَعَن سَمُرَةَ بْنِ جُنْدُبٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا يَمْنَعَنَّكُمْ مِنْ سُحُورِكُمْ أَذَانُ بِلَالٍ وَلَا الْفَجْرُ الْمُسْتَطِيلُ وَلَكِنِ الْفَجْرُ الْمُسْتَطِيرُ فِي الْأُفق» رَوَاهُ مُسلم وَلَفظه لِلتِّرْمِذِي
sunnah.com