Quran 69:49 from Surah Al-Haaqqa on Divine Marvels.
وَإِنَّا لَنَعۡلَمُ أَنَّ مِنكُم مُّكَذِّبِينَ
English translation: And indeed We surely know that among you (are) deniers
Transliteration: wa-inna lana'lamu anna minkum mukadhibina