The word(s) "belief" appears 136 time(s) in 116 verse(s) in Quran in Mohsin Khan translation.

(1) And they say, "Our hearts are wrapped (i.e. do not hear or understand Allah's Word)." Nay, Allah has cursed them for their disbelief, so little is that which they believe.

(2) And (remember) when We took your covenant and We raised above you the Mount (saying), "Hold firmly to what We have given you and hear (Our Word)." They said, "We have heard and disobeyed." And their hearts absorbed (the worship of) the calf because of their disbelief. Say: "Worst indeed is that which your faith enjoins on you if you are believers."

(3) Or do you want to ask your Messenger (Muhammad صلى الله عليه وسلم) as Musa (Moses) was asked before (i.e. show us openly our Lord)? And he who changes Faith for disbelief, verily, he has gone astray from the Right Way.

(4) And fight them until there is no more Fitnah (disbelief and worshipping of others along with Allah) and (all and every kind of) worship is for Allah (Alone). But if they cease, let there be no transgression except against Az-Zalimun (the polytheists, and wrong-doers)

(5) Ask the Children of Israel how many clear Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) We gave them. And whoever changes Allah's Favour after it had come to him, [e.g. renounces the Religion of Allah (Islam) and accepts Kufr (disbelief)] then surely, Allah is Severe in punishment.

(6) And (remember) when the angels said: "O Maryam (Mary)! Verily, Allah has chosen you, purified you (from polytheism and disbelief), and chosen you above the women of the 'Alamin (mankind and jinn) (of her lifetime)."

(7) Then when 'Îsa (Jesus) came to know of their disbelief, he said: "Who will be my helpers in Allah's Cause?" Al-Hawariyyun (the disciples) said: "We are the helpers of Allah; we believe in Allah, and bear witness that we are Muslims (i.e. we submit to Allah)."

(8) How shall Allah guide a people who disbelieved after their belief and after they bore witness that the Messenger (Muhammad صلى الله عليه وسلم) is true and after clear proofs had come unto them? And Allah guides not the people who are Zalimun (polytheists and wrong-doers).

(9) Verily, those who disbelieved after their belief and then went on increasing in their disbelief (i.e. disbelief in the Qur'an and in Prophet Muhammad صلى الله عليه وسلم) - never will their repentance be accepted [because they repent only by their tongues and not from their hearts]. And they are those who are astray.

(10) Let there arise out of you a group of people inviting to all that is good (Islam), enjoining Al-Ma'ruf (i.e. Islamic Monotheism and all that Islam orders one to do) and forbidding Al-Munkar (polytheism and disbelief and all that Islam has forbidden). And it is they who are the successful.