The word(s) "liar" appears 25 time(s) in 25 verse(s) in Quran in Abdullah Yusuf Ali translation.

(21) "Is it that the Message is sent to him, of all people amongst us? Nay, he is a liar, an insolent one!"

(22) Ah! they will know on the morrow, which is the liar, the insolent one!

(23) One day will Allah raise them all up (for Judgment): then will they swear to Him as they swear to you: And they think that they have something (to stand upon). No, indeed! they are but liars!

(24) 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.

(25) When the Hypocrites come to thee, they say, "We bear witness that thou art indeed the Messenger of Allah." Yea, Allah knoweth that thou art indeed His Messenger, and Allah beareth witness that the Hypocrites are indeed liars.