The word(s) "let" appears 168 time(s) in 139 verse(s) in Quran in Muhammad Habib Shakir translation.

(81) Surely Firon exalted himself in the land and made its people into parties, weakening one party from among them; he slaughtered their sons and let their women live; surely he was one of the mischiefmakers.

(82) He said: I desire to marry one of these two daughters of mine to you on condition that you should serve me for eight years; but if you complete ten, it will be of your own free will, and I do not wish to be hard to you; if Allah please, you will find me one of the good.

(83) And let them not turn you aside from the communications of Allah after they have been revealed to you, and call (men) to your Lord and be not of the polytheists.

(84) Therefore be patient; surely the promise of Allah is true and let not those who have no certainty hold you in light estimation.

(85) O my son! surely if it is the very weight of the grain of a mustard-seed, even though it is in (the heart of) rock, or (high above) in the heaven or (deep down) in the earth, Allah will bring it (to light); surely Allah is Knower of subtleties, Aware;

(86) Do you not see that Allah has made what is in the heavens and what is in the earth subservient to you, and made complete to you His favors outwardly and inwardly? And among men is he who disputes in respect of Allah though having no knowledge nor guidance, nor a book giving light.

(87) And whoever disbelieves, let not his disbelief grieve you; to Us is their return, then will We inform them of what they did surely Allah is the Knower of what is in the breasts.

(88) O people! guard against (the punishment of) your Lord and dread the day when a father shall not make any satisfaction for his son, nor shall the child be the maker of any satisfaction for his father; surely the promise of Allah is true, therefore let not this world's life deceive you, nor let the archdeceiver deceive you in respect of Allah.

(89) Then He made him complete and breathed into him of His spirit, and made for you the ears and the eyes and the hearts; little is it that you give thanks.

(90) And keep to mind what is recited in your houses of the communications of Allah and the wisdom; surely Allah is Knower of subtleties, Aware.