Hadith.1937 - In another narration, Imam (as) said: "It is the dawn about which there is no doubt."
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Source: Shaykh Muḥammad b. ʿAlī al-Ṣaduq
Similar narrations
Man Lā Yaḥḍuruh al-Faqīh #1431"The true Fajr (dawn) is the one that, when you see it, appears spread out horizontally, like the whiteness of the Surā river."