The word(s) "let" appears 245 time(s) in 205 verse(s) in Quran in Abdullah Yusuf Ali translation.

(151) For the evils of their Deeds will confront them, and they will be (completely) encircled by that which they used to mock at!

(152) None can dispute about the Signs of Allah but the Unbelievers. let not, then, their strutting about through the land deceive thee!

(153) Said Pharaoh: "Leave me to slay Moses; and let him call on his Lord! What I fear is lest he should change your religion, or lest he should cause mischief to appear in the land!"

(154) It is He Who has created you from dust then from a sperm-drop, then from a leech-like clot; then does he get you out (into the light) as a child: then lets you (grow and) reach your age of full strength; then lets you become old,- though of you there are some who die before;- and lets you reach a Term appointed; in order that ye may learn wisdom.

(155) So He completed them as seven firmaments in two Days, and He assigned to each heaven its duty and command. And We adorned the lower heaven with lights, and (provided it) with guard. Such is the Decree of (Him) the Exalted in Might, Full of Knowledge.

(156) But let those know, who dispute about Our Signs, that there is for them no way of escape.

(157) "Then why are not gold bracelets bestowed on him, or (why) come (not) with him angels accompanying him in procession?"

(158) let not the Evil One hinder you: for he is to you an enemy avowed.

(159) To them will be passed round, dishes and goblets of gold: there will be there all that the souls could desire, all that their eyes could delight in: and ye shall abide therein (for eye).

(160) Then will appear to them the evil (fruits) of what they did, and they will be completely encircled by that which they used to mock at!