The word(s) "delusion" appears 5 time(s) in 5 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) And behold! The Hypocrites and those in whose hearts is a disease (even) say: "Allah and His Messenger promised us nothing but delusion!"

(2) Say: "Have ye seen (these) 'Partners' of yours whom ye call upon besides Allah? Show Me what it is they have created in the (wide) earth. Or have they a share in the heavens? Or have We given them a Book from which they (can derive) clear (evidence)?- Nay, the wrong-doers promise each other nothing but delusions.

(3) Now, when he came to them in Truth, from Us, they said, "Slay the sons of those who believe with him, and keep alive their females," but the plots of Unbelievers (end) in nothing but errors (and delusions)!...

(4) They will say: "Yes indeed; a Warner did come to us, but we rejected him and said, 'Allah never sent down any (Message): ye are nothing but an egregious delusion!'"

(5) Nay, who is there that can help you, (even as) an army, besides (Allah) Most Merciful? In nothing but delusion are the Unbelievers.