The word(s) "believer" appears 309 time(s) in 259 verse(s) in Quran in Abdullah Yusuf Ali translation.

(81) And there were, among the desert Arabs (also), men who made excuses and came to claim exemption; and those who were false to Allah and His Messenger (merely) sat inactive. Soon will a grievous penalty seize the Unbelievers among them.

(82) And say: "Work (righteousness): Soon will Allah observe your work, and His Messenger, and the believers: Soon will ye be brought back to the knower of what is hidden and what is open: then will He show you the truth of all that ye did."

(83) And there are those who put up a mosque by way of mischief and infidelity - to disunite the believers - and in preparation for one who warred against Allah and His Messenger aforetime. They will indeed swear that their intention is nothing but good; But Allah doth declare that they are certainly liars.

(84) Allah hath purchased of the believers their persons and their goods; for theirs (in return) is the garden (of Paradise): they fight in His cause, and slay and are slain: a promise binding on Him in truth, through the Law, the Gospel, and the Qur'an: and who is more faithful to his covenant than Allah? then rejoice in the bargain which ye have concluded: that is the achievement supreme.

(85) Those that turn (to Allah) in repentance; that serve Him, and praise Him; that wander in devotion to the cause of Allah,: that bow down and prostrate themselves in prayer; that enjoin good and forbid evil; and observe the limit set by Allah;- (These do rejoice). So proclaim the glad tidings to the believers.

(86) It was not fitting for the people of Medina and the Bedouin Arabs of the neighbourhood, to refuse to follow Allah's Messenger, nor to prefer their own lives to his: because nothing could they suffer or do, but was reckoned to their credit as a deed of righteousness,- whether they suffered thirst, or fatigue, or hunger, in the cause of Allah, or trod paths to raise the ire of the Unbelievers, or received any injury whatever from an enemy: for Allah suffereth not the reward to be lost of those who do good;-

(87) Nor should the believers all go forth together: if a contingent from every expedition remained behind, they could devote themselves to studies in religion, and admonish the people when they return to them,- that thus they (may learn) to guard themselves (against evil).

(88) O ye who believe! fight the unbelievers who gird you about, and let them find firmness in you: and know that Allah is with those who fear Him.

(89) Now hath come unto you a Messenger from amongst yourselves: it grieves him that ye should perish: ardently anxious is he over you: to the believers is he most kind and merciful.

(90) Is it a matter of wonderment to men that We have sent Our inspiration to a man from among themselves?- that he should warn mankind (of their danger), and give the good news to the believers that they have before their Lord the lofty rank of truth. (But) say the Unbelievers: "This is indeed an evident sorcerer!"