The word(s) "believer" appears 651 time(s) in 556 verse(s) in Quran in Mohsin Khan translation.

(511) "My Lord! Forgive me, and my parents, and him who enters my home as a believer, and all the believing men and women. And to the Zalimun (polytheists, wrong-doers, and disbelievers) grant You no increase but destruction!"

(512) 'And of us some are Muslims (who have submitted to Allah, after listening to this Qur'an), and of us some are Al-Qasitun (disbelievers - those who have deviated from the Right Path)'. And whosoever has embraced Islam (i.e. has become a Muslim by submitting to Allah), then such have sought the Right Path."

(513) And as for the Qasitun (disbelievers who deviated from the Right Path), they shall be firewood for Hell,

(514) Far from easy for the disbelievers.

(515) And We have set none but angels as guardians of the Fire. And We have fixed their number (19) only as a trial for the disbelievers, in order that the people of the Scripture (Jews and Christians) may arrive at a certainty [that this Qur'an is the truth as it agrees with their Books regarding the number (19) which is written in the Taurat (Torah) and the Injeel (Gospel)] and that the believers may increase in Faith (as this Qur'an is the truth), and that no doubt may be left for the people of the Scripture and the believers, and that those in whose hearts is a disease (of hypocrisy) and the disbelievers may say: "What Allah intends by this (curious) example ?" Thus Allah leads astray whom He wills and guides whom He wills. And none can know the hosts of your Lord but He. And this (Hell) is nothing else than a (warning) reminder to mankind.

(516) Except those on the Right, (i.e. the pious true believers of Islamic Monotheism).

(517) About Al-Mujrimun (polytheists, criminals, disbelievers), (And they will say to them):

(518) Then what is wrong with them (i.e. the polytheists, the disbelievers) that they turn away from (receiving) admonition?

(519) And I swear by the self-reproaching person (a believer).

(520) Does man (a disbeliever) think that We shall not assemble his bones?