The word(s) "hearts" appears 124 time(s) in 116 verse(s) in Quran in Saheeh International translation.

(1) Allah has set a seal upon their hearts and upon their hearing, and over their vision is a veil. And for them is a great punishment.

(2) In their hearts is disease, so Allah has increased their disease; and for them is a painful punishment because they [habitually] used to lie.

(3) Then your hearts became hardened after that, being like stones or even harder. For indeed, there are stones from which rivers burst forth, and there are some of them that split open and water comes out, and there are some of them that fall down for fear of Allah. And Allah is not unaware of what you do.

(4) And they said, "Our hearts are wrapped." But, [in fact], Allah has cursed them for their disbelief, so little is it that they believe.

(5) And [recall] when We took your covenant and raised over you the mount, [saying], "Take what We have given you with determination and listen." They said [instead], "We hear and disobey." And their hearts absorbed [the worship of] the calf because of their disbelief. Say, "How wretched is that which your faith enjoins upon you, if you should be believers."

(6) Those who do not know say, "Why does Allah not speak to us or there come to us a sign?" Thus spoke those before them like their words. Their hearts resemble each other. We have shown clearly the signs to a people who are certain [in faith].

(7) Allah does not impose blame upon you for what is unintentional in your oaths, but He imposes blame upon you for what your hearts have earned. And Allah is Forgiving and Forbearing.

(8) It is He who has sent down to you, [O Muhammad], the Book; in it are verses [that are] precise - they are the foundation of the Book - and others unspecific. As for those in whose hearts is deviation [from truth], they will follow that of it which is unspecific, seeking discord and seeking an interpretation [suitable to them]. And no one knows its [true] interpretation except Allah. But those firm in knowledge say, "We believe in it. All [of it] is from our Lord." And no one will be reminded except those of understanding.

(9) [Who say], "Our Lord, let not our hearts deviate after You have guided us and grant us from Yourself mercy. Indeed, You are the Bestower.

(10) And hold firmly to the rope of Allah all together and do not become divided. And remember the favor of Allah upon you - when you were enemies and He brought your hearts together and you became, by His favor, brothers. And you were on the edge of a pit of the Fire, and He saved you from it. Thus does Allah make clear to you His verses that you may be guided.