The word(s) "let" appears 320 time(s) in 279 verse(s) in Quran in Muhammad Pickthal translation.

(61) We confound their hearts and their eyes. As they believed not therein at the first, We let them wander blindly on in their contumacy.

(62) In the day when He will gather them together (He will say): O ye assembly of the jinn! Many of humankind did ye seduce. And their adherents among humankind will say: Our Lord! We enjoyed one another, but now we have arrived at the appointed term which Thou appointedst for us. He will say: Fire is your home. Abide therein for ever, save him whom Allah willeth (to deliver). Lo! thy Lord is Wise, Aware.

(63) Thus We let some of the wrong-doers have power over others because of what they are wont to earn.

(64) Again, We gave the Scripture unto Moses, complete for him who would do good, an explanation of all things, a guidance and a mercy, that they might believe in the meeting with their Lord.

(65) Wait they, indeed, for nothing less than that the angels should come unto them, or thy Lord should come, or there should come one of the portents from thy Lord? In the day when one of the portents from thy Lord cometh, its belief availeth naught a soul which theretofore believed not, nor in its belief earned good (by works). Say: Wait ye! Lo! We (too) are waiting.

(66) (It is) a Scripture that is revealed unto thee (Muhammad) - so let there be no heaviness in thy heart therefrom - that thou mayst warn thereby, and (it is) a Reminder unto believers.

(67) O Children of Adam! let not Satan seduce you as he caused your (first) parents to go forth from the Garden and tore off from them their robe (of innocence) that he might manifest their shame to them. Lo! he seeth you, he and his tribe, from whence ye see him not. Lo! We have made the devils protecting friends for those who believe not.

(68) And to (the tribe of) Thamud (We sent) their brother Salih. He said: O my people! Serve Allah. Ye have no other Allah save Him. A wonder from your Lord hath come unto you. Lo! this is the camel of Allah, a token unto you; so let her feed in Allah's earth, and touch her not with hurt lest painful torment seize you.

(69) Approved upon condition that I speak concerning Allah nothing but the truth. I come unto you (lords of Egypt) with a clear proof from your Lord. So let the Children of Israel go with me.

(70) They said: O Moses! Either throw (first) or let us be the first throwers?