The word(s) "must" appears 25 time(s) in 24 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) 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.

(12) Every soul must taste of death, then to Us you shall be brought back.

(13) O my son! surely if it is the very weight of the grain of a mustard-seed, even though it is in (the heart of) rock, or (high above) in the heaven or (deep down) in the earth, Allah will bring it (to light); surely Allah is Knower of subtleties, Aware;

(14) You will see the unjust fearing on account of what they have earned, and it must befall them; and those who believe and do good shall be in the meadows of the gardens; they shall have what they please with their Lord: that is the great grace.

(15) And surely to our Lord we must return.

(16) And the judgment must most surely come about.

(17) Everyone on it must pass away.

(18) One demanding, demanded the chastisement which must befall

(19) Surely your Lord knows that you pass in prayer nearly two-thirds of the night, and (sometimes) half of it, and (sometimes) a third of it, and (also) a party of those with you; and Allah measures the night and the day. He knows that you are not able to do it, so He has turned to you (mercifully), therefore read what is easy of the Quran. He knows that there must be among you sick, and others who travel in the land seeking of the bounty of Allah, and others who fight in Allah's way, therefore read as much of it as is easy (to you), and keep up prayer and pay the poor-rate and offer to Allah a goodly gift, and whatever of good you send on beforehand for yourselves, you will find it with Allah; that is best and greatest in reward; and ask forgiveness of Allah; surely Allah is Forgiving, Merciful.

(20) Most surely what you are threatened with must come to pass.