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

(281) Are your disbelievers better than those, or have ye some immunity in the scriptures?

(282) What aileth you that ye believe not in Allah, when the messenger calleth you to believe in your Lord, and He hath already made a covenant with you, if ye are believers?

(283) On the day when thou (Muhammad) wilt see the believers, men and women, their light shining forth before them and on their right hands, (and wilt hear it said unto them): Glad news for you this day: Gardens underneath which rivers flow, wherein ye are immortal. That is the supreme triumph.

(284) And he who findeth not (the wherewithal), let him fast for two successive months before they touch one another; and for him who is unable to do so (the penance is) the feeding of sixty needy ones. This, that ye may put trust in Allah and His messenger. Such are the limits (imposed by Allah); and for disbelievers is a painful doom.

(285) Lo! those who oppose Allah and His messenger will be abased even as those before them were abased; and We have sent down clear tokens, and for disbelievers is a shameful doom

(286) Lo! Conspiracy is only of the devil, that he may vex those who believe; but he can harm them not at all unless by Allah's leave. In Allah let believers put their trust.

(287) He it is Who hath caused those of the People of the Scripture who disbelieved to go forth from their homes unto the first exile. Ye deemed not that they would go forth, while they deemed that their strongholds would protect them from Allah. But Allah reached them from a place whereof they recked not, and cast terror in their hearts so that they ruined their houses with their own hands and the hands of the believers. So learn a lesson, O ye who have eyes!

(288) O ye who believe! When believing women come unto you as fugitives, examine them. Allah is Best Aware of their faith. Then, if ye know them for true believers, send them not back unto the disbelievers. They are not lawful for them (the disbelievers), nor are they (the disbelievers) lawful for them. And give them (the disbelievers) that which they have spent (upon them). And it is no sin for you to marry such women when ye have given them their dues. And hold not to the ties of disbelieving women; and ask for (the return of) that which ye have spent; and let them (the disbelievers) ask for that which they have spent. That is the judgment of Allah. He judgeth between you. Allah is Knower, Wise.

(289) And if any of your wives have gone from you unto the disbelievers and afterward ye have your turn (of triumph), then give unto those whose wives have gone the like of that which they have spent, and keep your duty to Allah in Whom ye are believers.

(290) O ye who believe! Be not friendly with a folk with whom Allah is wroth, (a folk) who have despaired of the Hereafter as the disbelievers despair of those who are in the graves.