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

(221) And lo! for those who (now) do wrong there is an evil day like unto the evil day (which came for) their likes (of old); so let them not ask Me to hasten on (that day).

(222) Then let them produce speech the like thereof, if they are truthful.

(223) Or have they any stairway (unto heaven) by means of which they overhear (decrees). Then let their listener produce some warrant manifest!

(224) Then let them be (O Muhammad), till they meet their day, in which they will be thunder-stricken,

(225) And how many angels are in the heavens whose intercession availeth naught save after Allah giveth leave to whom He chooseth and accepteth.

(226) Lo! We let loose on them a raging wind on a day of constant calamity,

(227) When the event befalleth -

(228) What aileth you that ye believe not in Allah, when the messenger calleth you to believe in your Lord, and He hath already made a covenant with you, if ye are believers?

(229) And what aileth you that ye spend not in the way of Allah when unto Allah belongeth the inheritance of the heavens and the earth? Those who spent and fought before the victory are not upon a level (with the rest of you). Such are greater in rank than those who spent and fought afterwards. Unto each hath Allah promised good. And Allah is Informed of what ye do.

(230) Naught of disaster befalleth in the earth or in yourselves but it is in a Book before we bring it into being - Lo! that is easy for Allah -