The word(s) "warned" appears 16 time(s) in 16 verse(s) in Quran in Mohsin Khan translation.

(11) But if they turn away, then say (O Muhammad صلى الله عليه وسلم): "I have warned you of a Sa'iqah (a destructive awful cry, torment, hit, a thunderbolt) like the Sa'iqah which overtook 'Ad and Thamud (people)."

(12) We created not the heavens and the earth and all that is between them except with truth, and for an appointed term. But those who disbelieve turn away from that whereof they are warned.

(13) And remember (Hud) the brother of 'Ad, when he warned his people in Al-Ahqaf (the curved sand-hills in the southern part of Arabian Peninsula). And surely, there have passed away warners before him and after him (saying): "Worship none but Allah; truly, I fear for you the torment of a mighty Day (i.e. the Day of Resurrection)."

(14) And he [Lut (Lot)] indeed had warned them of Our Seizure (punishment), but they did doubt the warnings!

(15) Verily, We have warned you of a near torment - the Day when man will see that (the deeds) which his hands have sent forth, and the disbeliever will say: "Woe to me! Would that I were dust!"

(16) Therefore I have warned you of a blazing Fire (Hell).