The word(s) "devotion" appears 2 time(s) in 2 verse(s) in Quran in Saheeh International translation.

(1) And We took the Children of Israel across the sea; then they came upon a people intent in devotion to [some] idols of theirs. They said, "O Moses, make for us a god just as they have gods." He said, "Indeed, you are a people behaving ignorantly.

(سورة الأعراف, Al-A'raaf, Chapter #7, Verse #138)
(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) And remember the name of your Lord and devote yourself to Him with [complete] devotion.

(سورة المزمل, Al-Muzzammil, Chapter #73, Verse #8)
(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)