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

(131) Verily, Fir'aun (Pharaoh) exalted himself in the land and made its people sects, weakening (oppressing) a group (i.e. Children of Israel) among them: killing their sons, and letting their females live. Verily, he was of the Mufsidun (i.e. those who commit great sins and crimes, oppressors, tyrants).

(132) And to establish them in the land, and We let Fir'aun (Pharaoh) and Haman and their hosts receive from them that which they feared.

(133) He said: "I intend to wed one of these two daughters of mine to you, on condition that you serve me for eight years; but if you complete ten years, it will be (a favour) from you. But I intend not to place you under a difficulty. If Allah wills, you will find me one of the righteous."

(134) And let them not turn you (O Muhammad صلى الله عليه وسلم) away from (preaching) the Ayat (revelations and verses) of Allah after they have been sent down to you: and invite (men) to (believe in) your Lord and be not of Al-Mushrikun (those who associate partners with Allah, e.g. polytheists, pagans, idolaters, and those who disbelieve in the Oneness of Allah and deny the Prophethood of Messenger Muhammad صلى الله عليه وسلم).

(135) Alif-Lam-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings.]

(136) Alif-Lam-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].

(137) So set you (O Muhammad صلى الله عليه وسلم) your face towards the religion (of pure Islamic Monotheism) Hanif (worship none but Allah Alone). Allah's Fitrah (i.e. Allah's Islamic Monotheism) with which He has created mankind. No change let there be in Khalq-illah (i.e. the religion of Allah - Islamic Monotheism): that is the straight religion, but most of men know not. [Tafsir At-Tabari]

(138) So be patient (O Muhammad صلى الله عليه وسلم). Verily, the Promise of Allah is true; and let not those who have no certainty of faith, discourage you from conveying Allah's Message (which you are obliged to convey).

(139) Alif-Lam-Mim. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings].

(140) See you not (O men) that Allah has subjected for you whatsoever is in the heavens and whatsoever is in the earth, and has completed and perfected His Graces upon you, (both) apparent (i.e. Islamic Monotheism, and the lawful pleasures of this world, including health, good looks, etc.) and hidden [i.e. One's Faith in Allah (of Islamic Monotheism) knowledge, wisdom, guidance for doing righteous deeds, and also the pleasures and delights of the Hereafter in Paradise]? Yet of mankind is he who disputes about Allah without knowledge or guidance or a Book giving light!