وَقْتُ الصُّبْحِ مِنْ طُلُوعِ الْفَجْرِ الصَّادِقِ إِلَى قُبَيْلِ طُلُوعِ الشَّمْسِ
Fajr begins with true dawn: horizontal light spreading across the eastern horizon. It ends when sunrise begins. The earlier vertical light that rises and fades is false dawn and does not begin Fajr time.
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Prayer Obligation and the Five Daily Prayer Times
وَقْتُ الصُّبْحِ مِنْ طُلُوعِ الْفَجْرِ الصَّادِقِ إِلَى قُبَيْلِ طُلُوعِ الشَّمْسِ
Fajr begins with true dawn: horizontal light spreading across the eastern horizon. It ends when sunrise begins. The earlier vertical light that rises and fades is false dawn and does not begin Fajr time.