The word(s) "belief" appears 39 time(s) in 33 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) And they say: Our hearts are covered. Nay, Allah has cursed them on account of their unbelief; so little it is that they believe.

(2) And when We made a covenant with you and raised the mountain over you: Take hold of what We have given you with firmness and be obedient. They said: We hear and disobey. And they were made to imbibe (the love of) the calf into their hearts on account of their unbelief. Say: Evil is that which your belief bids you if you are believers.

(3) Rather you wish to put questions to your Apostle, as Musa was questioned before; and whoever adopts unbelief instead of faith, he indeed has lost the right direction of the way.

(4) But when Isa perceived unbelief on their part, he said Who will be my helpers in Allah's way? The disciples said: We are helpers (in the way) of Allah: We believe in Allah and bear witness that we are submitting ones.

(5) And a party of the followers of the Book say: Avow belief in that which has been revealed to those who believe, in the first part of the day, and disbelieve at the end of it, perhaps they go back on their religion.

(6) And neither would he enjoin you that you should take the angels and the prophets for lords; what! would he enjoin you with unbelief after you are Muslims?

(7) Surely, those who disbelieve after their believing, then increase in unbelief, their repentance shall not be accepted, and these are they that go astray.

(8) And that He might know the hypocrites; and it was said to them: Come, fight in Allah's way, or defend yourselves. They said: If we knew fighting, we would certainly have followed you. They were on that day much nearer to unbelief than to belief. They say with their mouths what is not in their hearts, and Allah best knows what they conceal.

(9) And let not those grieve you who fall into unbelief hastily; surely they can do no harm to Allah at all; Allah intends that He should not give them any portion in the hereafter, and they shall have a grievous chastisement.

(10) Surely those who have bought unbelief at the price of faith shall do no harm at all to Allah, and they shall have a painful chastisement.