The word(s) "heart" appears 161 time(s) in 147 verse(s) in Quran in Mohsin Khan translation.

(141) If you two (wives of the Prophet صلى الله عليه وسلم : 'Aishah and Hafsah رضي الله عنهما) turn in repentance to Allah, (it will be better for you), your hearts are indeed so inclined (to oppose what the Prophet صلى الله عليه وسلم likes); but if you help one another against him (Muhammad صلى الله عليه وسلم), then verily, Allah is his Maula (Lord, or Master, or Protector), and Jibril (Gabriel), and the righteous among the believers; and furthermore, the angels are his helpers.

(142) Say it is He Who has created you, and endowed you with hearing (ears) and seeing (eyes), and hearts. Little thanks you give.

(143) And We have set none but angels as guardians of the Fire. And We have fixed their number (19) only as a trial for the disbelievers, in order that the people of the Scripture (Jews and Christians) may arrive at a certainty [that this Qur'an is the truth as it agrees with their Books regarding the number (19) which is written in the Taurat (Torah) and the Injeel (Gospel)] and that the believers may increase in Faith (as this Qur'an is the truth), and that no doubt may be left for the people of the Scripture and the believers, and that those in whose hearts is a disease (of hypocrisy) and the disbelievers may say: "What Allah intends by this (curious) example ?" Thus Allah leads astray whom He wills and guides whom He wills. And none can know the hosts of your Lord but He. And this (Hell) is nothing else than a (warning) reminder to mankind.

(144) (Some) hearts that Day will shake with fear and anxiety.

(145) Nay! But on their hearts is the Ran (covering of sins and evil deeds) which they used to earn.

(146) Which leaps up over the hearts,

(147) "From the evil of the whisperer (devil who whispers evil in the hearts of men) who withdraws (from his whispering in one's heart after one remembers Allah).