The word(s) "warning" appears 38 time(s) in 37 verse(s) in Quran in Mohsin Khan translation.

(21) Giving glad tidings [of Paradise to the one who believes in the Oneness of Allah (i.e. Islamic Monotheism) and fears Allah much (abstains from all kinds of sins and evil deeds) and loves Allah much (performing all kinds of good deeds which He has ordained)], and warning (of punishment in the Hell-Fire to the one who disbelieves in the Oneness of Allah), but most of them turn away, so they hear not.

(22) We sent it (this Qur'an) down on a blessed night [(i.e. night of Al-Qadr, Surah No. 97) in the month of Ramadan - the 9th month of the Islamic calendar]. Verily, We are ever warning [mankind that Our Torment will reach those who disbelieve in Our Oneness of Lordship and in Our Oneness of worship].

(23) And the Trumpet will be blown - that will be the Day whereof warning (had been given) (i.e. the Day of Resurrection).

(24) And indeed there has come to them news (in this Qur'an) wherein there is (enough warning) to check (them from evil),

(25) Then how (terrible) was My Torment and My warnings?

(26) 'Ad (people) belied (their Prophet, Hud); then how (terrible) was My Torment and My warnings?

(27) Then, how (terrible) was My Torment and My warnings?

(28) Thamud (people also) belied the warnings.

(29) Then, how (terrible) was My Torment and My warnings?

(30) The people of Lut (Lot) belied the warnings.