Narrated by:Khubaib bin 'Abdur-Rahman that his paternal aunt Unaisah said
It was narrated from Khubaib bin 'Abdur-Rahman that his paternal aunt Unaisah said:"The Messenger of Allah (S.A.W) said: 'When Ibn Umm Maktum calls the Adhan, eat and drink, and when Bilal calls the Adhan, do not eat nor drink."
أَخْبَرَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، عَنْ هُشَيْمٍ، قَالَ أَنْبَأَنَا مَنْصُورٌ، عَنْ خُبَيْبِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ عَمَّتِهِ، أُنَيْسَةَ قَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا أَذَّنَ ابْنُ أُمِّ مَكْتُومٍ فَكُلُوا وَاشْرَبُوا وَإِذَا أَذَّنَ بِلاَلٌ فَلاَ تَأْكُلُوا وَلاَ تَشْرَبُوا " .
Nesai
The Book of the Adhan (The Call to Prayer) • Hadith 640