Quran 12:103 from Surah Yusuf on Divine Marvels.
وَمَآ أَكۡثَرُ ٱلنَّاسِ وَلَوۡ حَرَصۡتَ بِمُؤۡمِنِينَ
English translation: And not most (of) the mankind even though you desire (will be) believers
Transliteration: wama aktharu al-nasi walaw harasta bimu'minina