Samura bin Jundab reported,

He was delivering a sermon, narrating from the Prophet ﷺ that he said, "Do not let the call of Bilal deceive you, nor this whiteness, until the dawn appears," or he said, "until the dawn breaks."

Muslim 2547

Sahih

حدثنا عبيد الله بن معاذ حدثنا أبي حدثنا شعبة عن سوادة قال سمعت

سمرة بن جندب رضي الله عنه

وهو يخطب يحدث عن النبي ﷺ أنه قال لا يغرنكم نداء بلال ولا هذا البياض حتى يبدو الفجر أو قال حتى ينفجر الفجر

مسلم 2547صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Fasting
Chapter
Clarification that entering into fasting occurs at the rising of Fajr, and that one may eat and otherwise until Fajr rises, and clarification of the description of Fajr to which rulings are attached regarding entering into fasting, the beginning of the time for the morning prayer, and other matters
Numbering
Darussalam 2547
Muslim 2547