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

(1) But whoever disputes with you in this matter after what has come to you of knowledge, then say: Come let us call our sons and your sons and our women and your women and our near people and your near people, then let us be earnest in prayer, and pray for the curse of Allah on the liars.

(سورة آل عمران, Aal-i-Imraan, Chapter #3, Verse #61)
(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 what (reason) have we that we should not believe in Allah and in the truth that has come to us, while we earnestly desire that our Lord should cause us to enter with the good people?

(سورة المائدة, Al-Maaida, Chapter #5, Verse #84)
(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)