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

(11) (He has made it) straight to give warning (to the disbelievers) of a severe punishment from Him, and to give glad tidings to the believers (in the Oneness of Allah - Islamic Monotheism), who do righteous deeds, that they shall have a fair reward (i.e. Paradise).

(12) And thus We have sent it down as a Qur'an in Arabic, and have explained therein in detail the warnings, in order that they may fear Allah, or that it may cause them to have a lesson from it (or to have the honour for believing and acting on its teachings).

(13) They will say: "Glorified be You! It was not for us to take any Auliya' (Protectors, Helpers) besides You, but You gave them and their fathers comfort till they forgot the warning, and became a lost people (doomed to total loss).

(14) And you (O Muhammad صلى الله عليه وسلم) were not at the side of the Tur (Mount) when We did call: [it is said that Allah called the followers of Muhammad صلى الله عليه وسلم, and they answered His Call, or that Allah called Musa (Moses)]. But (you are sent) as a mercy from your Lord, to give warning to a people to whom no warner had come before you: in order that they may remember or receive admonition. [Tafsir At-Tabari].

(15) Then We saved him and those with him in the ship, and made it (the ship) an Ayah (a lesson, a warning) for the 'Alamin (mankind, jinn and all that exists).

(16) And indeed We have left thereof an evident Ayah (a lesson and a warning and a sign - the place where the Dead Sea is now in Palestine) for a folk who understand.

(17) So that they become ingrate for that which We have given them, and that they take their enjoyment (as a warning and a threat), but they will come to know.

(18) That he or it (Muhammad صلى الله عليه وسلم or the Qur'an) may give warning to him who is living (a healthy minded - the believer), and that Word (charge) may be justified against the disbelievers (dead, as they reject the warnings).

(19) And those who disbelieved will be driven to Hell in groups till, when they reach it, the gates thereof will be opened (suddenly like a prison at the arrival of the prisoners). And its keepers will say, "Did not the Messengers come to you from yourselves, reciting to you the Verses of your Lord, and warning you of the Meeting of this Day of yours?" They will say: "Yes, but the Word of torment has been justified against the disbelievers!"

(20) And indeed Yusuf (Joseph) did come to you, in times gone by, with clear signs, but you ceased not to doubt in that which he did bring to you: till when he died you said: "No Messenger will Allah send after him." Thus Allah leaves astray him who is a Musrif (a polytheist, an oppressor, a criminal, sinner who commit great sins) and a Murtab (one who doubts Allah's warning and His Oneness).