Days are mentioned in the Quran in these verses:
[2:80] Some have said, “Hell will not touch us, except for a limited number of days.” Say, “Have you taken such a pledge from God – God never breaks His pledge – or, are you saying about God what you do not know?”
[2:184] Specific days (are designated for fasting); if one is ill or traveling, an equal number of other days may be substituted. Those who can fast, but with great difficulty, may substitute feeding one poor person for each day of breaking the fast. If one volunteers (more righteous works), it is better. But fasting is the best for you, if you only knew.
[2:185] Ramadan is the month during which the Quran was revealed, providing guidance for the people, clear teachings, and the statute book. Those of you who witness this month shall fast therein. Those who are ill or traveling may substitute the same number of other days. God wishes for you convenience, not hardship, that you may fulfill your obligations, and to glorify God for guiding you, and to express your appreciation.
[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.
[2:196] You shall observe the complete rites of Hajj and`Umrah for God. If you are prevented, you shall send an offering, and do not resume cutting your hair until your offering has reached its destination. If you are ill, or suffering a head injury (and you must cut your hair), you shall expiate by fasting, or giving to charity, or some other form of worship. During the normal Hajj, if you break the state of Ihraam (sanctity) between `Umrah and Hajj, you shall expiate by offering an animal sacrifice. If you cannot afford it, you shall fast three days during Hajj and seven when you return home – this completes ten – provided you do not live at the Sacred Masjid. You shall observe God, and know that God is strict in enforcing retribution.
[2:203] You shall commemorate God for a number of days (in Mena); whoever hastens to do this in two days commits no sin, and whoever stays longer commits no sin, so long as righteousness is maintained. You shall observe God, and know that before Him you will be gathered.
[2:234] Those who die and leave wives, their widows shall wait four months and ten days (before they remarry). Once they fulfill their interim, you commit no error by letting them do whatever righteous matters they wish to do. God is fully Cognizant of everything you do.
[3:24] This is because they said, “The hellfire will not touch us, except for a few days.” They were thus deceived in their religion by their own fabrications.
[3:41] He said, “My Lord, give me a sign.” He said, “Your sign is that you will not speak to the people for three days, except through signals. Commemorate your Lord frequently; and meditate night and day.”
[3:140] If you suffer hardship, the enemy also suffers the same hardship. We alternate the days of victory and defeat among the people. God thus distinguishes the true believers, and blesses some of you with martyrdom. God dislikes injustice.
[3:154] After the setback, He sent down upon you peaceful slumber that pacified some of you. Others among you were selfishly concerned about themselves. They harbored thoughts about God that were not right – the same thoughts they had harbored during the days of ignorance. Thus, they said, “Is anything up to us?” Say, “Everything is up to God.” They concealed inside themselves what they did not reveal to you. They said, “If it was up to us, none of us would have been killed in this battle.” Say, “Had you stayed in your homes, those destined to be killed would have crawled into their death beds.” God thus puts you to the test to bring out your true convictions, and to test what is in your hearts. God is fully aware of the innermost thoughts.
[5:50] Is it the law of the days of ignorance that they seek to uphold? Whose law is better than God’s for those who have attained certainty?
[5:89] God does not hold you responsible for the mere utterance of oaths; He holds you responsible for your actual intentions. If you violate an oath, you shall atone by feeding ten poor people from the same food you offer to your own family, or clothing them, or by freeing a slave. If you cannot afford this, then you shall fast three days. This is the atonement for violating the oaths that you swore to keep. You shall fulfill your oaths. God thus explains His revelations to you, that you may be appreciative.
[7:54] Your Lord is the one God, who created the heavens and the earth in six days, then assumed all authority. The night overtakes the day, as it pursues it persistently, and the sun, the moon, and the stars are committed to serve by His command. Absolutely, He controls all creation and all commands. Most Exalted is God, Lord of the universe.
[10:3] Your only Lord is God; the One who created the heavens and the earth in six days, then assumed all authority. He controls all matters. There is no intercessor, except in accordance with His will. Such is God your Lord. You shall worship Him. Would you not take heed?
[11:7] He is the One who created the heavens and the earth in six days – and His (earthly) domain was completely covered with water – in order to test you, to distinguish those among you who work righteousness. Yet, when you say, “You will be resurrected after death,” those who disbelieve would say, “This is clearly witchcraft.”
[11:65] They slaughtered her. He then said, “You have only three days to live. This is a prophecy that is inevitable.”
[14:5] Thus, we sent Moses with our miracles, saying, “Lead your people out of darkness into the light, and remind them of the days of God.” These are lessons for every steadfast, appreciative person.
[20:103] Whispering among themselves, they will say, “You have stayed (in the first life) no more than ten days!”
[22:28] They may seek commercial benefits, and they shall commemorate God’s name during the specified days for providing them with livestock. “Eat therefrom and feed the despondent and the poor.”
[25:59] He is the One who created the heavens and the earth, and everything between them, in six days, then assumed all authority. The Most Gracious; ask about Him those who are well founded in knowledge.
[26:155] He said, “Here is a camel that will drink only on a day that is assigned to her; a day that is different from your specified days of drinking.
[32:4] God is the One who created the heavens and the earth, and everything between them in six days, then assumed all authority. You have none beside Him as Lord, nor do you have an intercessor. Would you not take heed?
[33:33] You shall settle down in your homes, and do not mingle with the people excessively, like you used to do in the old days of ignorance. You shall observe the Contact Prayers (Salat), and give the obligatory charity (Zakat), and obey God and His messenger. God wishes to remove all unholiness from you, O you who live around the Sacred Shrine, and to purify you completely.
[34:18] We placed between them and the communites that we blessed other oases, and we secured the journey between them: “Travel therein days and nights in complete security.”
[41:9] Say, “You disbelieve in the One who created the earth in two days, and you set up idols to rank with Him, though He is Lord of the universe.”
[41:10] He placed on it stabilizers (mountains), made it productive, and He calculated its provisions in four days, to satisfy the needs of all its inhabitants.
[41:11] Then He turned to the sky, when it was still gas, and said to it, and to the earth, “Come into existence, willingly or unwillingly.” They said, “We come willingly.”
[41:12] Thus, He completed the seven universes in two days, and set up the laws for every universe. And we adorned the lowest universe with lamps, and placed guards around it. Such is the design of the Almighty, the Omniscient.
[41:16] Consequently, we sent upon them violent wind, for a few miserable days. We thus afflicted them with humiliating retribution in this life, and the retribution of the Hereafter is more humiliating; they can never win.
[45:14] Tell those who believed to forgive those who do not expect the days of God. He will fully pay everyone for whatever they have earned.
[48:26] While those who disbelieved were enraged, and their hearts were filled with the pride of the days of ignorance, God blessed His messenger and the believers with peaceful contentment, and directed them to uphold the word of righteousness. This is what they well deserved. God is fully aware of all things.
[50:38] We have created the heavens and the earth, and everything between them in six days, and no fatigue touched us.
[57:4] He is the One who created the heavens and the earth in six days, then assumed all authority. He knows everything that enters into the earth, and everything that comes out of it, and everything that comes down from the sky, and everything that climbs into it. He is with you wherever you may be. God is Seer of everything you do.
[69:7] He unleashed it upon them for seven nights and eight days, violently. You could see the people tossed around like decayed palm trunks.
[69:24] Eat and drink happily in return for your works in days past.
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