The word(s) "lest" appears 51 time(s) in 50 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) He said: O my son! do not relate your vision to your brothers, lest they devise a plan against you; surely the Shaitan is an open enemy to man.

(22) He said: Surely it grieves me that you should take him off, and I fear lest the wolf devour him while you are heedless of him.

(23) And He has cast great mountains in the earth lest it might be convulsed with you, and rivers and roads that you may go aright,

(24) And do not make your oaths a means of deceit between you, lest a foot should slip after its stability and you should taste evil because you turned away from Allah's way and grievous punishment be your (lot).

(25) Do not associate with Allah any other god, lest you sit down despised, neglected.

(26) And do not make your hand to be shackled to your neck nor stretch it forth to the utmost (limit) of its stretching forth, lest you should (afterwards) sit down blamed, stripped off.

(27) This is of what your Lord has revealed to you of wisdom, and do not associate any other god with Allah lest you should be thrown into hell, blamed, cast away.

(28) And We have placed coverings on their hearts and a heaviness in their ears lest they understand it, and when you mention your Lord alone in the Quran they turn their backs in aversion.

(29) And who is more unjust than he who is reminded of the communications of his Lord, then he turns away from them and forgets what his two hands have sent before? Surely We have placed veils over their hearts lest they should understand it and a heaviness in their ears; and if you call them to the guidance, they will not ever follow the right course in that case.

(30) And as for the boy, his parents were believers and we feared lest he should make disobedience and ingratitude to come upon them: