The word(s) "believed" appears 189 time(s) in 171 verse(s) in Quran in Mohsin Khan translation.

(141) And he who believed said: "O my people! Verily, I fear for you a fate like that day (of disaster) of the Confederates (of old)!

(142) And the man who believed said: "O my people! Follow me, I will guide you to the way of right conduct [i.e. guide you to Allah's religion of Islamic Monotheism with which Musa (Moses) has been sent].

(143) And We saved those who believed and used to fear Allah, keep their duty to Him and avoid evil.

(144) Verily, those who disbelieved in the Reminder (i.e. the Qur'an) when it came to them (shall receive the punishment). And verily, it is an honourable well-fortified respected Book (because it is Allah's Speech, and He has protected it from corruption. (See V.15:9)

(145) And thus We have revealed to you (O Muhammad صلى الله عليه و سلم) a Qur'an in Arabic that you may warn the Mother of the Towns (Makkah) and all around it, and warn (them) of the Day of Assembling of which there is no doubt: when a party will be in Paradise (those who believed in Allah and followed what Allah's Messenger صلى الله عليه و سلم brought them) and a party in the blazing Fire (Hell) (those who disbelieved in Allah and followed not what Allah's Messenger صلى الله عليه و سلم brought them).

(146) (You) who believed in Our Ayat (proofs, verses, lessons, signs, revelations, etc.) and were Muslims (i.e. who submit totally to Allah's Will, and believe in the Oneness of Allah - Islamic Monotheism).

(147) And those whom they invoke instead of Him have no power of intercession - except for those who bear witness to the truth knowingly (i.e. believed in the Oneness of Allah, and obeyed His Orders), and they know (the facts about the Oneness of Allah).

(148) Then, as for those who believed (in the Oneness of Allah - Islamic Monotheism) and did righteous good deeds, their Lord will admit them to His Mercy. That will be the evident success.

(149) But as for those who disbelieved (it will be said to them): "Were not Our Verses recited to you? But you were proud, and you were a people who were Mujrimun (polytheists, disbelievers, sinners, criminals)."

(150) Say: "Tell me! If this (Qur'an) is from Allah and you deny it, and a witness from among the Children of Israel ('Abdullah bin Salam رضي الله عنه) testifies that [this Qur'an is from Allah (like the Taurat (Torah)], and he believed (embraced Islam) while you are too proud (to believe)." Verily, Allah guides not the people who are Zalimun (polytheists, disbelievers and wrong-doers).