The word(s) "believer" appears 350 time(s) in 314 verse(s) in Quran in Muhammad Pickthal translation.

(81) (It is) a Scripture that is revealed unto thee (Muhammad) - so let there be no heaviness in thy heart therefrom - that thou mayst warn thereby, and (it is) a Reminder unto believers.

(82) Who doeth greater wrong than he who inventeth a lie concerning Allah or denieth Our tokens. (For such) their appointed portion of the Book (of destiny) reacheth them till, when Our messengers come to gather them, they say: Where (now) is that to which ye cried beside Allah? They say: They have departed from us. And they testify against themselves that they were disbelievers.

(83) Who debar (men) from the path of Allah and would have it crooked, and who are disbelievers in the Last Day.

(84) And the dwellers of the Fire cry out unto the dwellers of the Garden: Pour on us some water or some wherewith Allah hath provided you. They say: Lo! Allah hath forbidden both to disbelievers (in His guidance),

(85) And We saved him and those with him by a mercy from Us, and We cut the root of those who denied Our revelations and were not believers.

(86) The chieftains of his people, who were scornful, said unto those whom they despised, unto such of them as believed: Know ye that Salih is one sent from his Lord? They said: Lo! In that wherewith he hath been sent we are believers.

(87) Those who were scornful said: Lo! in that which ye believe we are disbelievers.

(88) And unto Midian (We sent) their brother, Shu'eyb. He said: O my people! Serve Allah. Ye have no other Allah save Him. Lo! a clear proof hath come unto you from your Lord; so give full measure and full weight and wrong not mankind in their goods, and work not confusion in the earth after the fair ordering thereof. That will be better for you, if ye are believers.

(89) Such were the townships. We relate some tidings of them unto thee (Muhammad). Their messengers verily came unto them with clear proofs (of Allah's Sovereignty), but they could not believe because they had before denied. Thus doth Allah print upon the hearts of disbelievers (that they hear not).

(90) And when Moses came to Our appointed tryst and his Lord had spoken unto him, he said: My Lord! Show me (Thy Self), that I may gaze upon Thee. He said: Thou wilt not see Me, but gaze upon the mountain! If it stand still in its place, then thou wilt see Me. And when his Lord revealed (His) glory to the mountain He sent it crashing down. And Moses fell down senseless. And when he woke he said: Glory unto Thee! I turn unto Thee repentant, and I am the first of (true) believers.