The word(s) "tremble" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) He knows what is before them and what is behind them, and they do not intercede except for him whom He approves and for fear of Him they tremble.

(سورة الأنبياء, Al-Anbiyaa, Chapter #21, Verse #28)
(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) (To) those whose hearts tremble when Allah is mentioned, and those who are patient under that which afflicts them, and those who keep up prayer, and spend (benevolently) out of what We have given them.

(سورة الحج, Al-Hajj, Chapter #22, Verse #35)
(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)