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

(61) And they swore by Allah with the strongest of their oaths that if there came to them a warner they would be better guided than any of the nations; but when there came to them a warner it increased them in naught but aversion.

(62) That you may warn a people whose fathers were not warned, so they are heedless.

(63) And it is alike to them whether you warn them or warn them not: they do not believe.

(64) You can only warn him who follows the reminder and fears the Beneficent Allah in secret; so announce to him forgiveness and an honorable reward.

(65) That it may warn him who would have life, and (that) the word may prove true against the unbelievers.

(66) And certainly We sent among them warners.

(67) Then see how was the end of those warned,

(68) But when it shall descend in their court, evil shall then be the morning of the warned ones.

(69) And they wonder that there has come to them a warner from among themselves, and the disbelievers say: This is an enchanter, a liar.

(70) Say: I am only a warner, and there is no god but Allah, the One, the Subduer (of all):