Samura bin Jundab reported,

The Messenger of Allah ﷺ said, "Do not let Bilal's call to prayer deceive you, nor this whiteness of the rising dawn, until it spreads out like this."

Muslim 2545

Sahih

و حدثنا زهير بن حرب حدثنا إسمعيل ابن علية حدثني عبد الله بن سوادة عن أبيه

عن سمرة بن جندب رضي الله عنه قال

قال رسول الله ﷺ لا يغرنكم أذان بلال ولا هذا البياض لعمود الصبح حتى يستطير هكذا

مسلم 2545صحيح
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 2545
Muslim 2545