The word(s) "heart" appears 171 time(s) in 159 verse(s) in Quran in Muhammad Habib Shakir translation.

(111) And intercession will not avail aught with Him save of him whom He permits. Until when fear shall be removed from their hearts, They shall say: What is it that your Lord said? They shall say: The truth. And He is the Most High, the Great.

(112) Surely Allah is the Knower of what is unseen in the heavens and the earth; surely He is Cognizant of what is in the hearts.

(113) When he came to his Lord with a free heart,

(114) What! is he whose heart Allah has opened for Islam so that he is in a light from his Lord (like the hard-hearted)? Nay, woe to those whose hearts are hard against the remembrance of Allah; those are in clear error.

(115) Allah has revealed the best announcement, a book conformable in its various parts, repeating, whereat do shudder the skins of those who fear their Lord, then their skins and their hearts become pliant to the remembrance of Allah; this is Allah's guidance, He guides with it whom He pleases; and (as for) him whom Allah makes err, there is no guide for him.

(116) And when Allah alone is mentioned, the hearts of those who do not believe in the hereafter shrink, and when those besides Him are mentioned, lo! they are joyful.

(117) And warn them of the day that draws near, when hearts shall rise up to the throats, grieving inwardly; the unjust shall not have any compassionate friend nor any intercessor who should be obeyed.

(118) Those who dispute concerning the communications of Allah without any authority that He has given them; greatly hated is it by Allah and by-those who believe. Thus does Allah set a seal over the heart of every proud, haughty one.

(119) And they say: Our hearts are under coverings from that to which you call us, and there is a heaviness in our ears, and a veil hangs between us and you, so work, we too are working.

(120) Or do they say: He has forged a lie against Allah? But if Allah pleased, He would seal your heart; and Allah will blot out the falsehood and confirm the truth with His words; surely He is Cognizant of what is in the breasts.