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

(161) Make not the calling of the messenger among you as your calling one of another. Allah knoweth those of you who steal away, hiding themselves. And let those who conspire to evade orders beware lest grief or painful punishment befall them.

(162) And they say: What aileth this messenger (of Allah) that he eateth food and walketh in the markets? Why is not an angel sent down unto him, to be a warner with him.

(163) Then We said: Go together unto the folk who have denied Our revelations. Then We destroyed them, a complete destruction.

(164) (Saying): let the Children of Israel go with us.

(165) And when I sicken, then He healeth me,

(166) (How) that wherewith they were contented naught availeth them?

(167) Go with this my letter and throw it down unto them; then turn away and see what (answer) they return,

(168) (The Queen of Sheba) said (when she received the letter): O chieftains! Lo! there hath been thrown unto me a noble letter.

(169) And (remind them of) the Day when the Trumpet will be blown, and all who are in the heavens and the earth will start in fear, save him whom Allah willeth. And all come unto Him, humbled.

(170) And when he came unto the water of Midian he found there a whole tribe of men, watering. And he found apart from them two women keeping back (their flocks). He said: What aileth you? The two said: We cannot give (our flocks) to drink till the shepherds return from the water; and our father is a very old man.