The word(s) "hearts" appears 130 time(s) in 121 verse(s) in Quran in Muhammad Pickthal translation.

(91) And when Allah alone is mentioned, the hearts of those who believe not in the Hereafter are repelled, and when those (whom they worship) beside Him are mentioned, behold! they are glad.

(92) Warn them (O Muhammad) of the Day of the approaching (doom), when the hearts will be choking the throats, (when) there will be no friend for the wrong-doers, nor any intercessor who will be heard.

(93) And they say: Our hearts are protected from that unto which thou (O Muhammad) callest us, and in our ears there is a deafness, and between us and thee there is a veil. Act, then. Lo! we also shall be acting.

(94) And verily We had empowered them with that wherewith We have not empowered you, and had assigned them ears and eyes and hearts; but their ears and eyes and hearts availed them naught since they denied the revelations of Allah; and what they used to mock befell them.

(95) Among them are some who give ear unto thee (Muhammad) till, when they go forth from thy presence they say unto those who have been given knowledge: What was that he said just now? Those are they whose hearts Allah hath sealed, and they follow their own lusts.

(96) And those who believe say: If only a surah were revealed! But when a decisive surah is revealed and war is mentioned therein, thou seest those in whose hearts is a disease looking at thee with the look of men fainting unto death. Therefor woe unto them!

(97) Will they then not meditate on the Qur'an, or are there locks on the hearts?

(98) Or do those in whose hearts is a disease deem that Allah will not bring to light their (secret) hates?

(99) He it is Who sent down peace of reassurance into the hearts of the believers that they might add faith unto their faith. Allah's are the hosts of the heavens and the earth, and Allah is ever Knower, Wise -

(100) Those of the wandering Arabs who were left behind will tell thee: Our possessions and our households occupied us, so ask forgiveness for us! They speak with their tongues that which is not in their hearts. Say: Who can avail you aught against Allah, if He intend you hurt or intend you profit? Nay, but Allah is ever Aware of what ye do.