TABARANI 13379:
from Ibn ʿUmar —
[Machine] The Messenger of Allah ﷺ said, "Indeed, Bilal calls the Adhan at night, so continue eating and drinking until the Adhan of Ibn Umm Maktum." And it is claimed that when Bilal went down (to call the Adhan), Ibn Umm Maktum would call the Adhan.
الطبراني ١٣٣٧٩:
عن ابن عمر —
أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِنَّ بِلَالًا يُؤَذِّنُ بِلَيْلٍ فَكُلُوا وَاشْرَبُوا حَتَّى يُؤَذِّنَ ابْنُ أُمِّ مَكْتُومٍ» وَزَعَمَ أَنَّ بِلَالًا كَانَ يُؤَذِّنُ فَإِذَا نَزَلَ بِلَالٌ أَذَّنَ ابْنُ أُمِّ مَكْتُومٍ
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