The word(s) "know" appears 814 time(s) in 684 verse(s) in Quran in Mohsin Khan translation.

(321) And purchase not a small gain at the cost of Allah's Covenant. Verily! What is with Allah is better for you if you did but know.

(322) And when We change a Verse (of the Qur'an,) in place of another - and Allah knows best what He sends down - they (the disbelievers) say: "You (O Muhammad صلى الله عليه و سلم) are but a Muftari! (forger, liar)." Nay, but most of them know not.

(323) And indeed We know that they (polytheists and pagans) say: "It is only a human being who teaches him (Muhammad صلى الله عليه و سلم)." The tongue of the man they refer to is foreign, while this (the Qur'an) is a clear Arabic tongue.

(324) Invite (mankind, O Muhammad صلى الله عليه و سلم) to the Way of your Lord (i.e. Islam) with wisdom (i.e. with the Divine Revelation and the Qur'an) and fair preaching, and argue with them in a way that is better. Truly, your Lord knows best who has gone astray from His Path, and He is the Best Aware of those who are guided.

(325) And We have appointed the night and the day as two Ayat (signs etc.). Then, We have obliterated the sign of the night (with darkness) while We have made the sign of the day illuminating, that you may seek bounty from your Lord, and that you may know the number of the years and the reckoning. And We have explained everything (in detail) with full explanation.

(326) And how many generations have We destroyed after Nuh (Noah)! And Sufficient is your Lord as an All-knower and All-Beholder of the sins of His slaves.

(327) Your Lord knows best what is in your inner-selves. If you are righteous, then, verily, He is Ever Most Forgiving to those who turn unto Him again and again in obedience, and in repentance.

(328) Truly, your Lord enlarges the provision for whom He wills and straitens (for whom He wills). Verily, He is Ever All-knower, All-Seer of His slaves.

(329) And follow not (O man i.e., say not, or do not or witness not) that of which you have no knowledge. Verily! The hearing, and the sight, and the heart, of each of those one will be questioned (by Allah).

(330) We know best of what they listen to, when they listen to you. And when they take secret counsel, then the Zalimun (polytheists and wrong-doers) say: "You follow none but a bewitched man."