The word(s) "not" appears 1837 time(s) in 1517 verse(s) in Quran in Abdullah Yusuf Ali translation.

(501) Say: "Behold all that is in the heavens and on earth"; but neither Signs nor Warners profit those who believe not.

(502) Say: "O ye men! If ye are in doubt as to my religion, (behold!) I worship not what ye worship, other than Allah! But I worship Allah - Who will take your souls (at death): I am commanded to be (in the ranks) of the Believers,

(503) Say: "O ye men! Now Truth hath reached you from your Lord! those who receive guidance, do so for the good of their own souls; those who stray, do so to their own loss: and I am not (set) over you to arrange your affairs."

(504) He it is Who created the heavens and the earth in six Days - and His Throne was over the waters - that He might try you, which of you is best in conduct. But if thou wert to say to them, "Ye shall indeed be raised up after death", the Unbelievers would be sure to say, "This is nothing but obvious sorcery!"

(505) If We delay the penalty for them for a definite term, they are sure to say, "What keeps it back?" Ah! On the day it (actually) reaches them, nothing will turn it away from them, and they will be completely encircled by that which they used to mock at!

(506) not so do those who show patience and constancy, and work righteousness; for them is forgiveness (of sins) and a great reward.

(507) Perchance thou mayest (feel the inclination) to give up a part of what is revealed unto thee, and thy heart feeleth straitened lest they say, "Why is not a treasure sent down unto him, or why does not an angel come down with him?" But thou art there only to warn! It is Allah that arrangeth all affairs!

(508) "If then they (your false gods) answer not your (call), know ye that this revelation is sent down (replete) with the knowledge of Allah, and that there is no god but He! will ye even then submit (to Islam)?"

(509) They are those for whom there is nothing in the Hereafter but the Fire: vain are the designs they frame therein, and of no effect and the deeds that they do!

(510) Can they be (like) those who accept a Clear (Sign) from their Lord, and whom a witness from Himself doth teach, as did the Book of Moses before it,- a guide and a mercy? They believe therein; but those of the Sects that reject it,- the Fire will be their promised meeting-place. Be not then in doubt thereon: for it is the truth from thy Lord: yet many among men do not believe!