The word(s) "working" appears 3 time(s) in 3 verse(s) in Quran in Muhammad Pickthal translation.

(1) Say (O Muhammad): O my people! Work according to your power. Lo! I too am working. Thus ye will come to know for which of us will be the happy sequel. Lo! the wrong-doers will not be successful.

(سورة الأنعام, Al-An'aam, Chapter #6, Verse #135)
(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) As for the ship, it belonged to poor people working on the river, and I wished to mar it, for there was a king behind them who is taking every ship by force.

(سورة الكهف, Al-Kahf, Chapter #18, Verse #79)
(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)

(3) Thou, verily, O man, art working toward thy Lord a work which thou wilt meet (in His presence).

(سورة الإنشقاق, Al-Inshiqaaq, Chapter #84, Verse #6)
(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)