The word(s) "warns" appears 3 time(s) in 3 verse(s) in Quran in Saheeh International translation.

(1) Let not believers take disbelievers as allies rather than believers. And whoever [of you] does that has nothing with Allah, except when taking precaution against them in prudence. And Allah warns you of Himself, and to Allah is the [final] destination.

(2) The Day every soul will find what it has done of good present [before it] and what it has done of evil, it will wish that between itself and that [evil] was a great distance. And Allah warns you of Himself, and Allah is Kind to [His] servants."

(3) Allah warns you against returning to the likes of this [conduct], ever, if you should be believers.