The word(s) "existence" appears 2 time(s) in 2 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) "In derogation of Allah?" They will reply: "They have left us in the lurch: Nay, we invoked not, of old, anything (that had real existence)." Thus does Allah leave the Unbelievers to stray.

(سورة غافر, Ghafir, Chapter #40, Verse #74)
(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)

(2) No misfortune can happen on earth or in your souls but is recorded in a decree before We bring it into existence: That is truly easy for Allah:

(سورة الحديد, Al-Hadid, Chapter #57, Verse #22)
(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)