Quran 9:78 from Surah At-Tawba on Divine Marvels.
أَلَمۡ يَعۡلَمُوٓاْ أَنَّ ٱللَّهَ يَعۡلَمُ سِرَّهُمۡ وَنَجۡوَىٰهُمۡ وَأَنَّ ٱللَّهَ عَلَّٰمُ ٱلۡغُيُوبِ
English translation: Do not they know that Allah knows their secret and their secret conversation and that Allah (is) All-Knower (of) the unseen
Transliteration: alam ya'lamu anna al-laha ya'lamu sirrahum wanajwahum wa-anna al-laha allamu al-ghuyubi