The word(s) "fifth" appears 3 time(s) in 3 verse(s) in Quran in Saheeh International translation.

(1) And know that anything you obtain of war booty - then indeed, for Allah is one fifth of it and for the Messenger and for [his] near relatives and the orphans, the needy, and the [stranded] traveler, if you have believed in Allah and in that which We sent down to Our Servant on the day of criterion - the day when the two armies met. And Allah, over all things, is competent.

(سورة الأنفال, Al-Anfaal, Chapter #8, Verse #41)
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(2) And the fifth [oath will be] that the curse of Allah be upon him if he should be among the liars.

(سورة النور, An-Noor, Chapter #24, Verse #7)
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(3) And the fifth [oath will be] that the wrath of Allah be upon her if he was of the truthful.

(سورة النور, An-Noor, Chapter #24, Verse #9)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)