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

(61) Then, after him, We sent messengers unto their folk, and they brought them clear proofs. But they were not ready to believe in that which they before denied. Thus print We on the hearts of the transgressors.

(62) And Moses said: Our Lord! Lo! Thou hast given Pharaoh and his chiefs splendour and riches in the life of the world, Our Lord! that they may lead men astray from Thy way. Our Lord! Destroy their riches and harden their hearts so that they believe not till they see the painful doom.

(63) I say not unto you: "I have the treasures of Allah" nor "I have knowledge of the Unseen," nor say I: "Lo! I am an angel!" Nor say I unto those whom your eyes scorn that Allah will not give them good - Allah knoweth best what is in their hearts - Lo! then indeed I should be of the wrong-doers.

(64) And all that We relate unto thee of the story of the messengers is in order that thereby We may make firm thy heart. And herein hath come unto thee the Truth and an exhortation and a reminder for believers.

(65) And women in the city said: The ruler's wife is asking of her slave-boy an ill-deed. Indeed he has smitten her to the heart with love. We behold her in plain aberration.

(66) For him are angels ranged before him and behind him, who guard him by Allah's command. Lo! Allah changeth not the condition of a folk until they (first) change that which is in their hearts; and if Allah willeth misfortune for a folk there is none that can repel it, nor have they a defender beside Him.

(67) Who have believed and whose hearts have rest in the remembrance of Allah. Verily in the remembrance of Allah do hearts find rest!

(68) We verily sent Moses with Our revelations, saying: Bring thy people forth from darkness unto light. And remind them of the days of Allah. Lo! therein are revelations for each steadfast, thankful (heart).

(69) Our Lord! Lo! I have settled some of my posterity in an uncultivable valley near unto Thy holy House, our Lord! that they may establish proper worship; so incline some hearts of men that they may yearn toward them, and provide Thou them with fruits in order that they may be thankful.

(70) As they come hurrying on in fear, their heads upraised, their gaze returning not to them, and their hearts as air.