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

(151) No affliction comes about but by Allah's permission; and whoever believes in Allah, He guides aright his heart; and Allah is Cognizant of all things.

(152) If you both turn to Allah, then indeed your hearts are already inclined (to this); and if you back up each other against him, then surely Allah it is Who is his Guardian, and Jibreel and -the believers that do good, and the angels after that are the aiders.

(153) And conceal your word or manifest it; surely He is Cognizant of what is in the hearts.

(154) Say: He it is Who brought you into being and made for you the ears and the eyes and the hearts: little is it that you give thanks.

(155) And We have not made the wardens of the fire others than angels, and We have not made their number but as a trial for those who disbelieve, that those who have been given the book may be certain and those who believe may increase in faith, and those who have been given the book and the believers may not doubt, and that those in whose hearts is a disease and the unbelievers may say: What does Allah mean by this parable? Thus does Allah make err whom He pleases, and He guides whom He pleases, and none knows the hosts of your Lord but He Himself; and this is naught but a reminder to the mortals.

(156) hearts on that day shall palpitate,

(157) Nay! rather, what they used to do has become like rust upon their hearts.

(158) Which rises above the hearts.

(159) Who whispers into the hearts of men,