The word(s) "disbeliever" appears 377 time(s) in 355 verse(s) in Quran in Mohsin Khan translation.

(51) (Remember) when Allah will say (on the Day of Resurrection). "O 'Îsa (Jesus), son of Maryam (Mary)! Remember My Favour to you and to your mother when I supported you with Ruh-ul-Qudus [Jibril (Gabriel)] so that you spoke to the people in the cradle and in maturity; and when I taught you writing, Al-Hikmah (the power of understanding), the Taurat (Torah) and the Injeel (Gospel); and when you made out of the clay a figure like that of a bird, by My Permission, and you breathed into it, and it became a bird by My Permission, and you healed those born blind, and the lepers by My Permission, and when you brought forth the dead by My Permission; and when I restrained the Children of Israel from you (when they resolved to kill you) as you came unto them with clear proofs, and the disbelievers among them said: 'This is nothing but evident magic.'"

(52) And even if We had sent down unto you (O Muhammad صلى الله عليه وسلم) a Message written on paper so that they could touch it with their hands, the disbelievers would have said: "This is nothing but obvious magic!"

(53) Say (O Muhammad صلى الله عليه وسلم): "Shall I take as a Wali (Helper, Protector, Lord or God) any other than Allah, the Creator of the heavens and the earth? And it is He Who feeds but is not fed." Say: "Verily, I am commanded to be the first of those who submit themselves to Allah (as Muslims)." And be not you (O Muhammad صلى الله عليه وسلم) of the Mushrikun [polytheists, pagans, idolaters and disbelievers in the Oneness of Allah]. (Tafsir Al-Qurtubi)

(54) And of them there are some who listen to you; but We have set veils on their hearts, so they understand it not, and deafness in their ears; and even if they see every one of the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) they will not believe therein; to the point that when they come to you to argue with you, the disbelievers say: "These are nothing but tales of the men of old."

(55) It is only those who listen (to the Message of Prophet Muhammad صلى الله عليه وسلم), will respond (benefit from it), but as for the dead (i.e. disbelievers), Allah will raise them up, then to Him they will be returned (for their recompense).

(56) Say (to the disbelievers): "Tell me, if Allah took away your hearing and your sight, and sealed up your hearts, who is there - an ilah (a god) other than Allah who could restore them to you?" See how variously We explain the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), yet they turn aside.

(57) Those who fear Allah, keep their duty to Him and avoid evil are not responsible for them (the disbelievers) in any case, but (their duty) is to remind them, that they may fear Allah (and refrain from mocking at the Qur'an). [The provision of this Verse was abrogated by the Verse 4:140].

(58) They are those whom We gave the Book, Al-Hukm (understanding of the religious laws), and Prophethood. But if these disbelieve therein (the Book, Al-Hukm and Prophethood), then, indeed We have entrusted it to a people (such as the Companions of Prophet Muhammad صلى الله عليه وسلم) who are not disbelievers therein.

(59) Thus We explain variously the Verses so that they (the disbelievers) may say: "You have studied (the Books of the people of the Scripture and brought this Qur'an from that)" and that We may make the matter clear for the people who have knowledge.

(60) And insult not those whom they (disbelievers) worship besides Allah, lest they insult Allah wrongfully without knowledge. Thus We have made fair-seeming to each people its own doings; then to their Lord is their return and He shall then inform them of all that they used to do.