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

(11) A Book revealed to you-- so let there be no straitness in your breast on account of it-- that you may warn thereby, and a reminder close to the believers.

(12) What! do you wonder that a reminder has come to you from your Lord through a man from among you, that he might warn you and that you might guard (against evil) and so that mercy may be shown to you?

(13) What! do you wonder that a reminder has come to you from your Lord through a man from among you that he might warn you? And remember when He made you successors after Nuh's people and increased you in excellence in respect of make; therefore remember the benefits of Allah, that you may be successful.

(14) Do they not reflect that their companion has not unsoundness in mind; he is only a plain warner.

(15) Say: I do not control any benefit or harm for my own soul except as Allah please; and had I known the unseen I would have had much of good and no evil would have touched me; I am nothing but a warner and the giver of good news to a people who believe.

(16) And it does not beseem the believers that they should go forth all together; why should not then a company from every party from among them go forth that they may apply themselves to obtain understanding in religion, and that they may warn their people when they come back to them that they may be cautious?

(17) What! is it a wonder to the people that We revealed to a man from among themselves, saying: warn the people and give good news to those who believe that theirs is a footing of firmness with their Lord. The unbelievers say: This is most surely a manifest enchanter.

(18) But they rejected him, so We delivered him and those with him in the ark, and We made them rulers and drowned those who rejected Our communications; see then what was the end of the (people) warned.

(19) Say: Consider what is it that is in the heavens and the earth; and signs and warners do not avail a people who would not believe.

(20) That you shall not serve (any) but Allah; surely I am a warner for you from Him and a giver of good news,