The word(s) "hearts" appears 136 time(s) in 127 verse(s) in Quran in Muhammad Habib Shakir translation.

(51) Certainly Allah has turned (mercifully) to the Prophet and those who fled (their homes) and the helpers who followed him in the hour of straitness after the hearts of a part of them were about to deviate, then He turned to them (mercifully); surely to them He is Compassionate, Merciful.

(52) And as for those in whose hearts is a disease, it adds uncleanness to their uncleanness and they die while they are unbelievers.

(53) And whenever a chapter is revealed, they cast glances at one another: Does any one see you? Then they turn away: Allah has turned away their hearts because they are a people who do not understand.

(54) Then did We raise up after him apostles to their people, so they came to them with clear arguments, but they would not believe in what they had rejected before; thus it is that We set seals upon the hearts of those who exceed the limits.

(55) And Musa said: Our Lord! surely Thou hast given to Firon and his chiefs finery and riches in this world's life, to this end, our Lord, that they lead (people) astray from Thy way: Our Lord! destroy their riches and harden their hearts so that they believe not until they see the painful punishment.

(56) Those who believe and whose hearts are set at rest by the remembrance of Allah; now surely by Allah's remembrance are the hearts set at rest.

(57) O our Lord! surely I have settled a part of my offspring in a valley unproductive of fruit near Thy Sacred House, our Lord! that they may keep up prayer; therefore make the hearts of some people yearn towards them and provide them with fruits; haply they may be grateful:

(58) Hastening forward, their heads upraised, their eyes not reverting to them and their hearts vacant.

(59) Thus do We make it to enter into the hearts of the guilty;

(60) Your Allah is one Allah; so (as for) those who do not believe in the hereafter, their hearts are ignorant and they are proud.