The word(s) "three" appears 20 time(s) in 19 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) (Some) say: (They are) three, the fourth of them being their dog; and (others) say: Five, the sixth of them being their dog, making conjectures at what is unknown; and (others yet) say: Seven, and the eighth of them is their dog. Say: My Lord best knows their number, none knows them but a few; therefore contend not in the matter of them but with an outward contention, and do not question concerning them any of them.

(12) And they remained in their cave three hundred years and (some) add (another) nine.

(13) He said: My Lord! give me a sign. He said: Your sign is that you will not be able to speak to the people three nights while in sound health.

(14) O you who believe! let those whom your right hands possess and those of you who have not attained to puberty ask permission of you three times; before the morning prayer, and when you put off your clothes at midday in summer, and after the prayer of the nightfall; these are three times of privacy for you; neither is it a sin for you nor for them besides these, some of you must go round about (waiting) upon others; thus does Allah make clear to you the communications, and Allah is Knowing, Wise.

(15) All praise is due to Allah, the Originator of the heavens and the earth, the Maker of the angels, apostles flying on wings, two, and three, and four; He increases in creation what He pleases; surely Allah has power over all things.

(16) And you shall be three sorts.

(17) Do you not see that Allah knows whatever is in the heavens and whatever is in the earth? Nowhere is there a secret counsel between three persons but He is the fourth of them, nor (between) five but He is the sixth of them, nor less than that nor more but He is with them wheresoever they are; then He will inform them of what they did on the day of resurrection: surely Allah is Cognizant of all things.

(18) And (as for) those of your women who have despaired of menstruation, if you have a doubt, their prescribed time shall be three months, and of those too who have not had their courses; and (as for) the pregnant women, their prescribed time is that they lay down their burden; and whoever is careful of (his duty to) Allah He will make easy for him his affair.

(19) Walk on to the covering having three branches,