The word(s) "lest" appears 66 time(s) in 65 verse(s) in Quran in Mohsin Khan translation.

(31) "And as for the boy, his parents were believers, and we feared lest he should oppress them by rebellion and disbelief.

(32) He said: "My Lord! Indeed my bones have grown feeble, and grey hair has spread on my head, And I have never been unblest in my invocation to You, O my Lord!

(33) "And dutiful to my mother, and made me not arrogant, unblest.

(34) "O my father! Verily I fear lest a torment from the Most Gracious (Allah) should overtake you, so that you become a companion of Shaitan (Satan) (in the Hell-fire)." [Tafsir Al-Qurtubi]

(35) "And I shall turn away from you and from those whom you invoke besides Allah. And I shall call upon my Lord and I hope that I shall not be unblest in my invocation to my Lord."

(36) "Therefore, let not the one who believes not therein (i.e. in the Day of Resurrection, Reckoning, Paradise and Hell.), but follows his own lusts, divert you therefrom, lest you perish.

(37) They said: "Our Lord! Verily we fear lest he should hasten to punish us or lest he should transgress (all bounds against us)."

(38) Musa (Moses) said to them: "Woe unto you! Invent not a lie against Allah, lest He should destroy you completely by a torment. And surely, he who invents a lie (against Allah) will fail miserably."

(39) (Saying) eat of the Tayyibat (good lawful things) wherewith We have provided you, and commit no transgression or oppression therein, lest My Anger should justly descend on you. And he on whom My Anger descends, he is indeed perished. [Tafsir At-Tabari]

(40) He [Harun (Aaron)] said: "O son of my mother! Seize (me) not by my beard, nor by my head! Verily, I feared lest you should say: 'You have caused a division among the Children of Israel, and you have not respected my word!' "