The phrase fa-idhā ṭalaʿa al-fajr makes the arrival of true dawn the timing condition.
For example, someone who prays before true dawn simply because Fajr is described as “early” has not complied with the instruction. Praying early within the valid time and praying before the time begins are fundamentally different.
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Book of Hajj: Prayers, Standing at Muzdalifah, and Departure to Mina
The phrase fa-idhā ṭalaʿa al-fajr makes the arrival of true dawn the timing condition.
For example, someone who prays before true dawn simply because Fajr is described as “early” has not complied with the instruction. Praying early within the valid time and praying before the time begins are fundamentally different.