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

(51) How (can it be)! while if they prevail against you, they would not pay regard in your case to ties of relationship, nor those of covenant; they please you with their mouths while their hearts do not consent; and most of them are transgressors.

(52) Fight them, Allah will punish them by your hands and bring them to disgrace, and assist you against them and heal the hearts of a believing people.

(53) And remove the rage of their hearts; and Allah turns (mercifully) to whom He pleases, and Allah is Knowing, Wise.

(54) They only ask leave of you who do not believe in Allah and the latter day and their hearts are in doubt, so in their doubt do they waver.

(55) Alms are only for the poor and the needy, and the officials (appointed) over them, and those whose hearts are made to incline (to truth) and the (ransoming of) captives and those in debts and in the way of Allah and the wayfarer; an ordinance from Allah; and Allah is knowing, Wise.

(56) The hypocrites fear lest a chapter should be sent down to them telling them plainly of what is in their hearts. Say: Go on mocking, surely Allah will bring forth what you fear.

(57) So He made hypocrisy to follow as a consequence into their hearts till the day when they shall meet Him because they failed to perform towards Allah what they had promised with Him and because they told lies.

(58) They preferred to be with those who remained behind, and a seal is set on their hearts so they do not understand.

(59) The way (to blame) is only against those who ask permission of you though they are rich; they have chosen to be with those who remained behind, and Allah has set a seal upon their hearts so they do not know.

(60) The building which they have built will ever continue to be a source of disquiet in their hearts, except that their hearts get cut into pieces; and Allah is Knowing, Wise.