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

(71) Eat of that which Allah hath bestowed on you as food lawful and good, and keep your duty to Allah in Whom ye are believers.

(72) When the disciples said: O Jesus, son of Mary! Is thy Lord able to send down for us a table spread with food from heaven? He said: Observe your duty to Allah, if ye are true believers.

(73) Say (unto the disbelievers): Travel in the land, and see the nature of the consequence for the rejecters!

(74) Of them are some who listen unto thee, but We have placed upon their hearts veils, lest they should understand, and in their ears a deafness. If they saw every token they would not believe therein; to the point that, when they come unto thee to argue with thee, the disbelievers say: This is naught else than fables of the men of old.

(75) If thou couldst see when they are set before the Fire and say: Oh, would that we might return! Then would we not deny the revelations of our Lord but we would be of the believers!

(76) Say (O Muhammad, to the disbelievers): I say not unto you (that) I possess the treasures of Allah, nor that I have knowledge of the Unseen; and I say not unto you: Lo! I am an angel. I follow only that which is inspired in me. Say: Are the blind man and the seer equal? Will ye not then take thought?

(77) Those are they unto whom We gave the Scripture and command and prophethood. But if these disbelieve therein, then indeed We shall entrust it to a people who will not be disbelievers therein.

(78) Eat of that over which the name of Allah hath been mentioned, if ye are believers in His revelations.

(79) Is he who was dead and We have raised him unto life, and set for him a light wherein he walketh among men, as him whose similitude is in utter darkness whence he cannot emerge? Thus is their conduct made fairseeming for the disbelievers.

(80) O ye assembly of the jinn and humankind! Came there not unto you messengers of your own who recounted unto you My tokens and warned you of the meeting of this your Day? They will say: We testify against ourselves. And the life of the world beguiled them. And they testify against themselves that they were disbelievers.