Quran 28:69 from Surah Al-Qasas on Divine Marvels.
وَرَبُّكَ يَعۡلَمُ مَا تُكِنُّ صُدُورُهُمۡ وَمَا يُعۡلِنُونَ
English translation: And your Lord knows what conceals their breasts and what they declare
Transliteration: warabbuka ya'lamu ma tukinnu suduruhum wama yu'linuna