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

(41) Those only are believers whose hearts become full of fear when Allah is mentioned, and when His communications are recited to them they increase them in faith, and in their Lord do they trust.

(42) And Allah only gave it as a good news and that your hearts might be at ease thereby; and victory is only from Allah; surely Allah is Mighty, Wise.

(43) When He caused calm to fall on you as a security from Him and sent down upon you water from the cloud that He might thereby purify you, and take away from you the uncleanness of the Shaitan, and that He might fortify your hearts and steady (your) footsteps thereby.

(44) When your Lord revealed to the angels: I am with you, therefore make firm those who believe. I will cast terror into the hearts of those who disbelieve. Therefore strike off their heads and strike off every fingertip of them.

(45) O you who believe! answer (the call of) Allah and His Apostle when he calls you to that which gives you life; and know that Allah intervenes between man and his heart, and that to Him you shall be gathered.

(46) When Allah showed them to you in your dream as few; and if He had shown them to you as many you would certainly have become weak-hearted and you would have disputed about the matter, but Allah saved (you); surely He is the Knower of what is in the breasts.

(47) And obey Allah and His Apostle and do not quarrel for then you will be weak in hearts and your power will depart, and be patient; surely Allah is with the patient.

(48) When the hypocrites and those in whose hearts was disease said: Their religion has deceived them; and whoever trusts in Allah, then surely Allah is Mighty, Wise.

(49) And united their hearts; had you spent all that is in the earth, you could not have united their hearts, but Allah united them; surely He is Mighty, Wise.

(50) O Prophet! say to those of the captives who are in your hands: If Allah knows anything good in your hearts, He will give to you better than that which has been taken away from you and will forgive you, and Allah is Forgiving, Merciful.