The word(s) "hearts" appears 132 time(s) in 121 verse(s) in Quran in Mohsin Khan translation.

(51) And if every person who had wronged (by disbelieving in Allah and by worshipping others besides Allah) possessed all that is on the earth and sought to ransom himself therewith (it will not be accepted), and they would feel in their hearts regret when they see the torment, and they will be judged with justice, and no wrong will be done unto them.

(52) Then after him We sent Messengers to their people. They brought them clear proofs, but they would not believe what they had already rejected beforehand. Thus We seal the hearts of the transgressors (those who disbelieve in the Oneness of Allah and disobey Him).

(53) And Musa (Moses) said: "Our Lord! You have indeed bestowed on Fir'aun (Pharaoh) and his chiefs splendour and wealth in the life of this world, our Lord! that they may lead men astray from Your Path. Our Lord! Destroy their wealth, and harden their hearts, so that they will not believe until they see the painful torment."

(54) Those who believed (in the Oneness of Allah - Islamic Monotheism), and whose hearts find rest in the remembrance of Allah: verily, in the remembrance of Allah do hearts find rest .

(55) "O our Lord! I have made some of my offspring to dwell in an uncultivable valley by Your Sacred House (the Ka'bah at Makkah) in order, O our Lord, that they may perform As-Salat (Iqamat-as-Salat). So fill some hearts among men with love towards them, and (O Allah) provide them with fruits so that they may give thanks.

(56) (They will be) hastening forward with necks outstretched, their heads raised up (towards the sky), their gaze returning not towards them and their hearts empty (from thinking because of extreme fear).

(57) Thus do We let it (polytheism and disbelief) enter the hearts of the Mujrimun [criminals, polytheists and pagans (because of their mocking at the Messengers)].

(58) Your Ilah (God) is One Ilah (God - Allah, none has the right to be worshipped but He). But for those who believe not in the Hereafter, their hearts deny (the faith in the Oneness of Allah), and they are proud.

(59) And Allah has brought you out from the wombs of your mothers while you know nothing. And He gave you hearing, sight, and hearts that you might give thanks (to Allah).

(60) They are those upon whose hearts, hearing (ears) and sight (eyes) Allah has set a seal. And they are the heedless!