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

(61) "lest the soul should (then) say: 'Ah! Woe is me!- In that I neglected (my duty) towards Allah, and was but among those who mocked!'-

(62) "Or (lest) it should say: 'If only Allah had guided me, I should certainly have been among the righteous!'-

(63) "Or (lest) it should say when it (actually) sees the penalty: 'If only I had another chance, I should certainly be among those who do good!'

(64) Said Pharaoh: "Leave me to slay Moses; and let him call on his Lord! What I fear is lest he should change your religion, or lest he should cause mischief to appear in the land!"

(65) "Ye did not seek to hide yourselves, lest your hearing, your sight, and your skins should bear witness against you! But ye did think that Allah knew not many of the things that ye used to do!

(66) And the Unbelievers will say: "Our Lord! Show us those, among Jinns and men, who misled us: We shall crush them beneath our feet, so that they become the vilest (before all)."

(67) The same religion has He established for you as that which He enjoined on Noah - the which We have sent by inspiration to thee - and that which We enjoined on Abraham, Moses, and Jesus: Namely, that ye should remain steadfast in religion, and make no divisions therein: to those who worship other things than Allah, hard is the (way) to which thou callest them. Allah chooses to Himself those whom He pleases, and guides to Himself those who turn (to Him).

(68) O ye who believe! Raise not your voices above the voice of the Prophet, nor speak aloud to him in talk, as ye may speak aloud to one another, lest your deeds become vain and ye perceive not.

(69) O ye who believe! If a wicked person comes to you with any news, ascertain the truth, lest ye harm people unwittingly, and afterwards become full of repentance for what ye have done.