The word(s) "heart" appears 169 time(s) in 159 verse(s) in Quran in Muhammad Pickthal translation.

(91) Is there in their hearts a disease, or have they doubts, or fear they lest Allah and His messenger should wrong them in judgment? Nay, but such are evil-doers.

(92) And those who disbelieve say: Why is the Qur'an not revealed unto him all at once? (It is revealed) thus that We may strengthen thy heart therewith; and We have arranged it in right order.

(93) Save him who bringeth unto Allah a whole heart.

(94) Upon thy heart, that thou mayst be (one) of the warners,

(95) Thus do We make it traverse the hearts of the guilty.

(96) And the heart of the mother of Moses became void, and she would have betrayed him if We had not fortified her heart, that she might be of the believers.

(97) Thrust thy hand into the bosom of thy robe it will come forth white without hurt. And guard thy heart from fear. Then these shall be two proofs from your Lord unto Pharaoh and his chiefs. Lo! they are evil-living folk.

(98) But it is clear revelations in the hearts of those who have been given knowledge, and none deny Our revelations save wrong-doers.

(99) Thus doth Allah seal the hearts of those who know not.

(100) O my dear son! Establish worship and enjoin kindness and forbid iniquity, and persevere whatever may befall thee. Lo! that is of the steadfast heart of things.