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

(141) Then We made Our apostles to follow in their footsteps, and We sent Isa son of Marium afterwards, and We gave him the Injeel, and We put in the hearts of those who followed him kindness and mercy; and (as for) monkery, they innovated it-- We did not prescribe it to them-- only to seek Allah's pleasure, but they did not observe it with its due observance; so We gave to those of them who believed their reward, and most of them are transgressors.

(142) You shall not find a people who believe in Allah and the latter day befriending those who act in opposition to Allah and His Apostle, even though they were their (own) fathers, or their sons, or their brothers, or their kinsfolk; these are they into whose hearts He has impressed faith, and whom He has strengthened with an inspiration from Him: and He will cause them to enter gardens beneath which rivers flow, abiding therein; Allah is well-pleased with them and they are well-pleased with Him these are Allah's party: now surely the party of Allah are the successful ones.

(143) He it is Who caused those who disbelieved of the followers of the Book to go forth from their homes at the first banishment you did not think that they would go forth, while they were certain that their fortresses would defend them against Allah; but Allah came to them whence they did not expect, and cast terror into their hearts; they demolished their houses with their own hands and the hands of the believers; therefore take a lesson, O you who have eyes!

(144) And those who made their abode in the city and in the faith before them love those who have fled to them, and do not find in their hearts a need of what they are given, and prefer (them) before themselves though poverty may afflict them, and whoever is preserved from the niggardliness of his soul, these it is that are the successful ones.

(145) And those who come after them say: Our Lord! forgive us and those of our brethren who had precedence of us in faith, and do not allow any spite to remain in our hearts towards those who believe, our Lord! surely Thou art Kind, Merciful.

(146) You are certainly greater in being feared in their hearts than Allah; that is because they are a people who do not understand

(147) They will not fight against you in a body save in fortified towns or from behind walls; their fighting between them is severe, you may think them as one body, and their hearts are disunited; that is because they are a people who have no sense.

(148) And when Musa said to his people: O my people! why do you give me trouble? And you know indeed that I am Allah's apostle to you; but when they turned aside, Allah made their hearts turn aside, and Allah does not guide the transgressing people.

(149) That is because they believe, then disbelieve, so a seal is set upon their hearts so that they do not understand.

(150) He knows what is in the heavens and the earth, and He knows what you hide and what you manifest; and Allah is Cognizant of what is in the hearts.