The word(s) "steadfastness" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Pickthal translation.

(1) O ye who believe! Seek help in steadfastness and prayer. Lo! Allah is with the steadfast.

(سورة البقرة, Al-Baqara, Chapter #2, Verse #153)
(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) Thou takest vengeance on us only forasmuch as we believed the tokens of our Lord when they came unto us. Our Lord! Vouchsafe unto us steadfastness and make us die as men who have surrendered (unto Thee).

(سورة الأعراف, Al-A'raaf, Chapter #7, Verse #126)
(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)