The word(s) "heart" appears 161 time(s) in 147 verse(s) in Quran in Mohsin Khan translation.

(61) 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."

(62) And all that We relate to you (O Muhammad صلى الله عليه و سلم) of the news of the Messengers is in order that We may make strong and firm your heart thereby. And in this (chapter of the Qur'an) has come to you the truth, as well as an admonition and a reminder for the believers.

(63) 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 .

(64) "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.

(65) (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).

(66) 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)].

(67) 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.

(68) 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).

(69) Whoever disbelieved in Allah after his belief, except him who is forced thereto and whose heart is at rest with Faith; but such as open their breasts to disbelief, on them is wrath from Allah, and theirs will be a great torment.

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