The word(s) "not" appears 1997 time(s) in 1622 verse(s) in Quran in Muhammad Pickthal translation.

(511) And of them is he who defameth thee in the matter of the alms. If they are given thereof they are content, and if they are not given thereof, behold! they are enraged.

(512) Know they not that whoso opposeth Allah and His messenger, his verily is fire of hell, to abide therein? That is the extreme abasement.

(513) The hypocrites, both men and women, proceed one from another. They enjoin the wrong, and they forbid the right, and they withhold their hands (from spending for the cause of Allah). They forget Allah, so He hath forgotten them. Lo! the hypocrites, they are the transgressors.

(514) Hath not the fame of those before them reached them - the folk of Noah, A'ad, Thamud, the folk of Abraham, the dwellers of Midian and the disasters (which befell them)? Their messengers (from Allah) came unto them with proofs (of Allah's Sovereignty). So Allah surely wronged them not, but they did wrong themselves.

(515) And the believers, men and women, are protecting friends one of another; they enjoin the right and forbid the wrong, and they establish worship and they pay the poor-due, and they obey Allah and His messenger. As for these, Allah will have mercy on them. Lo! Allah is Mighty, Wise.

(516) They swear by Allah that they said nothing (wrong), yet they did say the word of disbelief, and did disbelieve after their Surrender (to Allah). And they purposed that which they could not attain, and they sought revenge only that Allah by His messenger should enrich them of His bounty. If they repent it will be better for them; and if they turn away, Allah will afflict them with a painful doom in the world and the Hereafter, and they have no protecting friend nor helper in the earth.

(517) Know they not that Allah knoweth both their secret and the thought that they confide, and that Allah is the Knower of Things Hidden?

(518) Ask forgiveness for them (O Muhammad), or ask not forgiveness for them; though thou ask forgiveness for them seventy times Allah will not forgive them. That is because they disbelieved in Allah and His messenger, and Allah guideth not wrongdoing folk.

(519) Those who were left behind rejoiced at sitting still behind the messenger of Allah, and were averse to striving with their wealth and their lives in Allah's way. And they said: Go not forth in the heat! Say: The fire of hell is more intense of heat, if they but understood.

(520) Let not their wealth nor their children please thee! Allah purposeth only to punish them thereby in the world, and that their souls shall pass away while they are disbelievers.