The word(s) "lest" appears 73 time(s) in 69 verse(s) in Quran in Abdullah Yusuf Ali translation.

(51) "Thou art no more than a mortal like us: then bring us a Sign, if thou tellest the truth!"

(52) "Touch her not with harm, lest the Penalty of a Great Day seize you."

(53) At length, when they came to a (lowly) valley of ants, one of the ants said: "O ye ants, get into your habitations, lest Solomon and his hosts crush you (under foot) without knowing it."

(54) She said: "Kings, when they enter a country, despoil it, and make the noblest of its people its meanest thus do they behave.

(55) He said: "O my Lord! I have slain a man among them, and I fear lest they slay me.

(56) "Do ye indeed approach men, and cut off the highway?- and practise wickedness (even) in your councils?" But his people gave no answer but this: they said: "Bring us the Wrath of Allah if thou tellest the truth."

(57) He created the heavens without any pillars that ye can see; He set on the earth mountains standing firm, lest it should shake with you; and He scattered through it beasts of all kinds. We send down rain from the sky, and produce on the earth every kind of noble creature, in pairs.

(58) O Consorts of the Prophet! Ye are not like any of the (other) women: if ye do fear (Allah), be not too complacent of speech, lest one in whose heart is a disease should be moved with desire: but speak ye a speech (that is) just.

(59) O Prophet! Tell thy wives and daughters, and the believing women, that they should cast their outer garments over their persons (when abroad): that is most convenient, that they should be known (as such) and not molested. And Allah is Oft-Forgiving, Most Merciful.

(60) It is Allah Who sustains the heavens and the earth, lest they cease (to function): and if they should fail, there is none - not one - can sustain them thereafter: Verily He is Most Forbearing, Oft-Forgiving.