The Sunset are 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.

[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.

[20:130] Therefore, be patient in the face of their utterances, and praise and glorify your Lord before sunrise and before sunset. And during the night glorify Him, as well as at both ends of the day, that you may be happy.

[50:39] Therefore, be patient in the face of their utterances, and praise and glorify your Lord before sunrise, and before sunset.

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