The word(s) "hearken" appears 16 time(s) in 16 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) "If any does not hearken to the one who invites (us) to Allah, he cannot frustrate (Allah's Plan) on earth, and no protectors can he have besides Allah: such men (wander) in manifest error."

(12) Hast thou not observed the Hypocrites say to their misbelieving brethren among the People of the Book? - "If ye are expelled, we too will go out with you, and we will never hearken to any one in your affair; and if ye are attacked (in fight) we will help you". But Allah is witness that they are indeed liars.

(13) So hearken not to those who deny (the Truth).

(14) Therefore be patient with constancy to the Command of thy Lord, and hearken not to the sinner or the ingrate among them.

(15) And hearkens to (the Command of) its Lord, and it must needs (do so);-

(16) And hearkens to (the Command of) its Lord,- and it must needs (do so);- (then will come Home the full reality).