The word(s) "warn" appears 150 time(s) in 135 verse(s) in Quran in Mohsin Khan translation.

(51) They will say: "Glorified be You! It was not for us to take any Auliya' (Protectors, Helpers) besides You, but You gave them and their fathers comfort till they forgot the warning, and became a lost people (doomed to total loss).

(52) And had We willed, We would have raised a warner in every town.

(53) And We have sent you (O Muhammad صلى الله عليه وسلم) only as a bearer of glad tidings and a warner.

(54) "But we are a host all assembled, amply fore-warned."

(55) I am only a plain warner."

(56) And We rained on them a rain (of torment). And how evil was the rain of those who had been warned!

(57) Upon your heart (O Muhammad صلى الله عليه وسلم) that you may be (one) of the warners,

(58) And never did We destroy a township but it had its warners

(59) And warn your tribe (O Muhammad صلى الله عليه وسلم) of near kindred.

(60) And We rained down on them a rain (of stones). So evil was the rain of those who were warned.