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

(41) And fear the Fire, which is prepared for the disbelievers.

(42) Many similar ways (and mishaps of life) were faced by nations (believers and disbelievers) that have passed away before you (as you have faced in the battle of Uhud), so travel through the earth, and see what was the end of those who disbelieved (in the Oneness of Allah, and disobeyed Him and His Messengers).

(43) So do not become weak (against your enemy), nor be sad, and you will be superior (in victory) if you are indeed (true) believers.

(44) And that Allah may test (or purify) the believers (from sins) and destroy the disbelievers.

(45) Muhammad (صلى الله عليه وسلم) is no more than a Messenger, and indeed (many) Messengers have passed away before him. If he dies or is killed, will you then turn back on your heels (as disbelievers)? And he who turns back on his heels, not the least harm will he do to Allah; and Allah will give reward to those who are grateful.

(46) And Allah did indeed fulfil His Promise to you when you were killing them (your enemy) with His Permission; until (the moment) you lost your courage and fell to disputing about the order, and disobeyed after He showed you (of the booty) which you love. Among you are some that desire this world and some that desire the Hereafter. Then He made you flee from them (your enemy), that He might test you. But surely, He forgave you, and Allah is Most Gracious to the believers.

(47) If Allah helps you, none can overcome you; and if He forsakes you, who is there after Him that can help you? And in Allah (Alone) let believers put their trust.

(48) Indeed Allah conferred a great favour on the believers when He sent among them a Messenger (Muhammad صلى الله عليه وسلم) from among themselves, reciting unto them His Verses (the Qur'an), and purifying them (from sins by their following him), and instructing them (in) the Book (the Qur'an) and Al-Hikmah [the wisdom and the Sunnah of the Prophet صلى الله عليه وسلم (i.e. his legal ways, statements, acts of worship)], while before that they had been in manifest error.

(49) And what you suffered (of the disaster) on the day (of the battle of Uhud when) the two armies met, was by the leave of Allah, in order that He might test the believers.

(50) They rejoice in a Grace and a Bounty from Allah, and that Allah will not waste the reward of the believers.