The Messenger of Allah ﷺ said, "Let none of you be kept from his predawn meal by the call of Bilal," or he said, "by the announcement of Bilal, for he calls out," or he said, "he announces, so that the one of you standing in prayer may return, and the one sleeping may be roused. The dawn is not when it appears like this," or he said, "like this, but rather when it appears like this."
حدثنا إسماعيل عن سليمان عن أبي عثمان
قال رسول الله ﷺ لا يمنعن أحدكم أذان بلال أو قال نداء بلال من سحوره فإنه يؤذن أو قال ينادي ليرجع قائمكم ولينبه نائمكم ثم ليس أن يقول هكذا أو قال هكذا حتى يقول هكذا