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

(81) That he or it (Muhammad صلى الله عليه وسلم or the Qur'an) may give warning to him who is living (a healthy minded - the believer), and that Word (charge) may be justified against the disbelievers (dead, as they reject the warnings).

(82) And indeed We sent among them warners (Messengers);

(83) Then see what was the end of those who were warned (but heeded not).

(84) Then, when it descends in their courtyard (i.e. near to them), evil will be the morning for those who had been warned!

(85) And they (Arab pagans) wonder that a warner (Prophet Muhammad صلى الله عليه وسلم) has come to them from among themselves. And the disbelievers say: "This (Prophet Muhammad صلى الله عليه وسلم) is a sorcerer, a liar.

(86) Say (O Muhammad صلى الله عليه وسلم): "I am only a warner and there is no Ilah (God) except Allah (none has the right to be worshipped but Allah) the One, the Irresistible,

(87) "Only this has been revealed to me, that I am a plain warner."

(88) And those who disbelieved will be driven to Hell in groups till, when they reach it, the gates thereof will be opened (suddenly like a prison at the arrival of the prisoners). And its keepers will say, "Did not the Messengers come to you from yourselves, reciting to you the Verses of your Lord, and warning you of the Meeting of this Day of yours?" They will say: "Yes, but the Word of torment has been justified against the disbelievers!"

(89) (He is Allah) Owner of High Ranks and Degrees, the Owner of the Throne. He sends the revelation by His Command to any of His slaves He wills, that he (the person who receives revelation) may warn (men) of the Day of Mutual Meeting (i.e. the Day of Resurrection).

(90) And warn them (O Muhammad صلى الله عليه وسلم) of the Day that is drawing near (i.e. the Day of Resurrection), when the hearts will be choking the throats, and they can neither return them (hearts) to their chests nor can they throw them out. There will be no friend, nor an intercessor for the Zalimun (polytheists and wrong-doers), who could be given heed to.