Dawn is mentioned in the Quran in these verses:
[2:187] Permitted for you is sexual intercourse with your wives during the nights of fasting. They are the keepers of your secrets, and you are the keepers of their secrets. God knew that you used to betray your souls, and He has redeemed you, and has pardoned you. Henceforth, you may have intercourse with them, seeking what God has permitted for you. You may eat and drink until the white thread of light becomes distinguishable from the dark thread of night at dawn. Then, you shall fast until sunset. Sexual intercourse is prohibited if you decide to retreat to the masjid (during the last ten days of Ramadan). These are God’s laws; you shall not transgress them. God thus clarifies His revelations for the people, that they may attain salvation.
[3:17] They are steadfast, truthful, submitting, charitable, and meditators at dawn.
[6:96] At the crack of dawn, He causes the morning to emerge. He made the night still, and He rendered the sun and the moon to serve as calculation devices. Such is the design of the Almighty, the Omniscient.
[17:78] You shall observe the Contact Prayer (Salat) when the sun declines from its highest point at noon, as it moves towards sunset. You shall also observe (the recitation of) the Quran at dawn. (Reciting) the Quran at dawn is witnessed.
[24:58] O you who believe, permission must be requested by your servants and the children who have not attained puberty (before entering your rooms). This is to be done in three instances – before the Dawn Prayer, at noon when you change your clothes to rest, and after the Night Prayer. These are three private times for you. At other times, it is not wrong for you or them to mingle with one another. God thus clarifies the revelations for you. God is Omniscient, Most Wise.
[51:18] At dawn, they prayed for forgiveness.
[52:49] Also during the night glorify Him, and at dawn as the stars fade away.
[54:34] We showered them with rocks. Only Lot’s family was saved at dawn.
[89:1] By the dawn.
[89:2] And the ten nights.
[97:5] Peaceful it is until the advent of the dawn.
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