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

(91) Upon your heart (O Muhammad صلى الله عليه وسلم) that you may be (one) of the warners,

(92) Thus have We caused it (the denial of the Qur'an) to enter the hearts of the Mujrimun (criminals, polytheists, sinners).

(93) And the heart of the mother of Musa (Moses) became empty [from every thought, except the thought of Musa (Moses)]. She was very near to disclose his (case, i.e. the child is her son), had We not strengthened her heart (with Faith), so that she might remain as one of the believers.

(94) Thus does Allah seal up the hearts of those who know not [the proofs and evidence of the Oneness of Allah i.e. those who try not to understand true facts that which you (Muhammad صلى الله عليه وسلم) have brought to them].

(95) Then He fashioned him in due proportion, and breathed into him the soul (created by Allah for that person); and He gave you hearing (ears), sight (eyes) and hearts. Little is the thanks you give!

(96) Allah has not made for any man two hearts inside his body. Neither has He made your wives whom you declare to be like your mothers' backs, your real mothers. [az-Zihar is the saying of a husband to his wife, "You are to me like the back of my mother" i.e. You are unlawful for me to approach], nor has He made your adopted sons your real sons. That is but your saying with your mouths. But Allah says the truth, and He guides to the (Right) Way.

(97) Call them (adopted sons) by (the names of) their fathers: that is more just with Allah. But if you know not their father's (names, call them) your brothers in faith and Mawalikum (your freed slaves). And there is no sin on you concerning that in which you made a mistake , except in regard to what your hearts deliberately intend. And Allah is Ever Oft-Forgiving, Most Merciful.

(98) When they came upon you from above you and from below you, and when the eyes grew wild and the hearts reached to the throats, and you were harbouring doubts about Allah.

(99) And when the hypocrites and those in whose hearts is a disease (of doubts) said: "Allah and His Messenger (صلى الله عليه وسلم) promised us nothing but delusion!"

(100) And those of the people of the Scripture who backed them (the disbelievers), Allah brought them down from their forts and cast terror into their hearts, (so that) a group (of them) you killed, and a group (of them) you made captives.