Three is mentioned in the Quran in these verses:

[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.

[2:228] The divorced women shall wait three menstruations (before marrying another man). It is not lawful for them to conceal what God creates in their wombs, if they believe in God and the Last Day. (In case of pregnancy,) the husband’s wishes shall supersede the wife’s wishes, if he wants to remarry her. The women have rights, as well as obligations, equitably. Thus, the man’s wishes prevail (in case of pregnancy). God is Almighty, Most Wise.

[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.”

[3:124] You told the believers, “Is it not enough that your Lord supports you with three thousand angels, sent down?”

[4:3] If you deem it best for the orphans, you may marry their mothers – you may marry two, three, or four. If you fear lest you become unfair, then you shall be content with only one, or with what you already have. Additionally, you are thus more likely to avoid financial hardship.

[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.

[9:118] Also (redeemed were) the three who stayed behind. The spacious earth became so straitened for them, that they almost gave up all hope for themselves. Finally, they realized that there was no escape from God, except to Him. He then redeemed them that they may repent. God is the Redeemer, Most Merciful.

[11:65] They slaughtered her. He then said, “You have only three days to live. This is a prophecy that is inevitable.”

[18:22] Some would say, “They were three; their dog being the fourth,” while others would say, “Five; the sixth being their dog,” as they guessed. Others said, “Seven,” and the eighth was their dog. Say, “My Lord is the best knower of their number.” Only a few knew the correct number. Therefore, do not argue with them; just go along with them. You need not consult anyone about this.

[18:23] You shall not say that you will do anything in the future,

[18:24] without saying, “God willing.” If you forget to do this, you must immediately remember your Lord and say, “May my Lord guide me to do better next time.”

[18:25] They stayed in their cave three hundred years, increased by nine.

[19:10] He said, “My Lord, give me a sign.” He said, “Your sign is that you will not speak to the people for three consecutive nights.”

[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.

[35:1] Praise be to God, Initiator of the heavens and the earth, and appointer of the angels to be messengers with wings – two, three, and four (wings). He increases the creation as He wills. God is Omnipotent.

[56:7] You will be stratified into three kinds.

[56:8] Those who deserved bliss will be in bliss.

[56:9] Those who deserved misery will be in misery.

[56:10] Then there is the elite of the elite.

[58:7] Do you not realize that God knows everything in the heavens and everything on earth? No three people can conspire secretly without Him being their fourth, nor five without Him being the sixth, nor less than that, nor more, without Him being there with them wherever they may be. Then, on the Day of Resurrection, He will inform them of everything they had done. God is fully aware of all things.

[65:4] As for the women who have reached menopause, if you have any doubts, their interim shall be three months. As for those who do not menstruate, and discover that they are pregnant, their interim ends upon giving birth. Anyone who reverences God, He makes everything easy for him.

[77:29] Go to what you used to disbelieve in.

[77:30] Go to a shade of three different densities.

[77:31] Yet, it provides neither coolness, nor protection from the heat.

[77:32] It throws sparks as big as mansions.

[77:33] As yellow as the color of camels.

To learn more, read the Quran in English.

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