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

(301) And indeed they have passed by the town [of Prophet Lut (Lot)] on which was rained the evil rain. Did they (disbelievers) not then see it (with their own eyes)? Nay! But they used not to expect any resurrection.

(302) So obey not the disbelievers, but strive against them (by preaching) with the utmost endeavour with it (the Qur'an).

(303) And they (disbelievers, polytheists) worship besides Allah that which can neither profit them nor harm them; and the disbeliever is ever a helper (of the Satan) against his Lord.

(304) Say (O Muhammad صلى الله عليه وسلم to the disbelievers): "My Lord pays attention to you only because of your invocation to Him. But now you have indeed denied (Him). So the torment will be yours for ever (inseparable, permanent punishment)."

(305) It may be that you (O Muhammad صلى الله عليه وسلم) are going to kill yourself with grief, that they do not become believers [in your Risalah (Messengership) i.e. in your Message of Islamic Monotheism].

(306) Verily, in this is an Ayah (proof or sign), yet most of them (polytheists, pagans who do not believe in Resurrection) are not believers.

(307) "Verily we really hope that our Lord will forgive us our sins, as we are the first of the believers [in Musa (Moses) and in the Monotheism which he has brought from Allah]."

(308) Verily in this is indeed a sign (or a proof), yet most of them are not believers.

(309) (Alas!) If we only had a chance to return (to the world), we shall truly be among the believers!

(310) Verily in this is indeed a sign, yet most of them are not believers.