The word(s) "let" appears 241 time(s) in 215 verse(s) in Quran in Mohsin Khan translation.

(81) Alif-Lam-Ra. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].These are Verses of the Book and a plain Qur'an.

(82) Leave them to eat and enjoy, and let them be preoccupied with (false) hope. They will come to know!

(83) Thus do We let it (polytheism and disbelief) enter the hearts of the Mujrimun [criminals, polytheists and pagans (because of their mocking at the Messengers)].

(84) "So, when I have fashioned him completely and breathed into him (Adam) the soul which I created for him, then fall (you) down prostrating yourselves unto him."

(85) "Then travel in a part of the night with your family, and you go behind them in the rear, and let no one amongst you look back, but go on to where you are ordered."

(86) So, when the promise came for the first of the two, We sent against you slaves of Ours given to terrible warfare. They entered the very innermost parts of your homes. And it was a promise (completely) fulfilled.

(87) And when We decide to destroy a town (population), We (first) send a definite order (to obey Allah and be righteous) to those among them [or We (first) increase in number those of its population] who lead a life of luxury. Then, they transgress therein, and thus the word (of torment) is justified against it (them). Then We destroy it with complete destruction.

(88) And let not your hand be tied (like a miser) to your neck, nor stretch it forth to its utmost reach (like a spendthrift), so that you become blameworthy and in severe poverty.

(89) And do not kill anyone whose killing Allah has forbidden, except for a just cause. And whoever is killed wrongfully (Mazluman intentionally with hostility and oppression and not by mistake), We have given his heir the authority [to demand Qisas, - Law of Equality in punishment - or to forgive, or to take Diyah (blood money)]. But let him not exceed limits in the matter of taking life (i.e he should not kill except the killer). Verily, he is helped (by the Islamic law).

(90) And say (O Muhammad صلى الله عليه و سلم): My Lord! let my entry (to the city of Al-Madinah) be good, and (likewise) my exit (from the city of Makkah) be good. And grant me from You an authority to help me (or a firm sign or a proof).