The word(s) "warn" appears 127 time(s) in 113 verse(s) in Quran in Muhammad Habib Shakir translation.

(81) We did not create the heavens and the earth and what is between them two save with truth and (for) an appointed term; and those who disbelieve turn aside from what they are warned of.

(82) Say: I am not the first of the apostles, and I do not know what will be done with me or with you: I do not follow anything but that which is revealed to me, and I am nothing but a plain warner.

(83) And before it the Book of Musa was a guide and a mercy: and this is a Book verifying (it) in the Arabic language that it may warn those who are unjust and as good news for the doers of good.

(84) And mention the brother of Ad; when he warned his people in the sandy plains,-- and indeed warners came before him and after him-- saying Serve none but Allah; surely I fear for you the punishment of a grievous day.

(85) And when We turned towards you a party of the jinn who listened to the Quran; so when they came to it, they said: Be silent; then when it was finished, they turned back to their people warning (them).

(86) Surely We have sent you as a witness and as a bearer of good news and as a warner,

(87) Nay! they wonder that there has come to them a warner from among themselves, so the unbelievers say: This is a wonderful thing:

(88) Therefore fly to Allah, surely I am a plain warner to you from Him.

(89) And do not set up with Allah another god: surely I am a plain warner to you from Him.

(90) This is a warner of the warners of old.