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

(61) And let not their wealth or their children amaze you. Allah's Plan is to punish them with these things in this world, and that their souls shall depart (die) while they are disbelievers.

(62) O you who believe! Fight those of the disbelievers who are close to you, and let them find harshness in you; and know that Allah is with those who are Al-Muttaqun (the pious - See V.2:2).

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

(64) And when We let mankind taste mercy after some adversity has afflicted them, behold! they take to plotting against Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.)! Say: "Allah is more Swift in planning!" Certainly, Our Messengers (angels) record all of that which you plot.

(65) Say: "In the Bounty of Allah, and in His Mercy (i.e. Islam and the Qur'an); - therein let them rejoice." That is better than what (the wealth) they amass.

(66) And let not their speech grieve you (O Muhammad صلى الله عليه وسلم), for all power and honour belong to Allah. He is the All-Hearer, the All-Knower.

(67) And recite to them the news of Nuh (Noah). When he said to his people: "O my people, if my stay (with you), and my reminding (you) of the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of Allah is hard on you, then I put my trust in Allah. So devise your plot, you and your partners, and let not your plot be in doubt for you. Then pass your sentence on me and give me no respite.

(68) Alif-Lam-Ra. [These letters are one of the miracles of the Qur'an and none but Allah (Alone) knows their meanings]. (This is) a Book, the Verses whereof are perfected (in every sphere of knowledge), and then explained in detail from One (Allah) Who is All-Wise Well-Acquainted (with all things).

(69) But if We let him taste good (favour) after evil (poverty and harm) has touched him, he is sure to say: "Ills have departed from me." Surely, he is exultant, and boastful (ungrateful to Allah).

(70) They (messengers) said: "O Lut (Lot)! Verily, we are the messengers from your Lord! They shall not reach you! So travel with your family in a part of the night, and let not any of you look back; but your wife (will remain behind), verily, the punishment which will afflict them, will afflict her. Indeed, morning is their appointed time. Is not the morning near?"