The word(s) "warned" appears 14 time(s) in 14 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) But if they turn away, say thou: "I have warned you of a stunning Punishment (as of thunder and lightning) like that which (overtook) the 'Ad and the Thamud!"

(12) We created not the heavens and the earth and all between them but for just ends, and for a Term Appointed: But those who reject Faith turn away from that whereof they are warned.

(13) Mention (Hud) one of 'Ad's (own) brethren: Behold, he warned his people about the winding Sand-tracts: but there have been warners before him and after him: "Worship ye none other than Allah: Truly I fear for you the Penalty of a Mighty Day."

(14) Verily, We have warned you of a Penalty near, the Day when man will see (the deeds) which his hands have sent forth, and the Unbeliever will say, "Woe unto me! Would that I were (metre) dust!"