The word(s) "lest" appears 64 time(s) in 64 verse(s) in Quran in Muhammad Pickthal translation.

(11) And (He commandeth you, saying): This is My straight path, so follow it. Follow not other ways, lest ye be parted from His way. This hath He ordained for you, that ye may ward off (evil).

(12) lest ye should say: The Scripture was revealed only to two sects before us, and we in sooth were unaware of what they read;

(13) Or lest ye should say: If the Scripture had been revealed unto us, we surely had been better guided than are they. Now hath there come unto you a clear proof from your Lord, a guidance and mercy; and who doeth greater wrong than he who denieth the revelations of Allah, and turneth away from them? We award unto those who turn away from Our revelations an evil doom because of their aversion.

(14) And (unto man): O Adam! Dwell thou and thy wife in the Garden and eat from whence ye will, but come not nigh this tree lest ye become wrong-doers.

(15) Then Satan whispered to them that he might manifest unto them that which was hidden from them of their shame, and he said: Your Lord forbade you from this tree only lest ye should become angels or become of the immortals.

(16) And to (the tribe of) Thamud (We sent) their brother Salih. He said: O my people! Serve Allah. Ye have no other Allah save Him. A wonder from your Lord hath come unto you. Lo! this is the camel of Allah, a token unto you; so let her feed in Allah's earth, and touch her not with hurt lest painful torment seize you.

(17) And (remember) when thy Lord brought forth from the Children of Adam, from their reins, their seed, and made them testify of themselves, (saying): Am I not your Lord? They said: Yea, verily. We testify. (That was) lest ye should say at the Day of Resurrection: Lo! of this we were unaware;

(18) Or lest ye should say: (It is) only (that) our fathers ascribed partners to Allah of old and we were (their) seed after them. Wilt Thou destroy us on account of that which those who follow falsehood did?

(19) And remember, when ye were few and reckoned feeble in the land, and were in fear lest men should extirpate you, how He gave you refuge, and strengthened you with His help, and made provision of good things for you, that haply ye might be thankful.

(20) And obey Allah and His messenger, and dispute not one with another lest ye falter and your strength depart from you; but be steadfast! Lo! Allah is with the steadfast.