Quran 21:110 from Surah Al-Anbiyaa on Divine Marvels.
إِنَّهُۥ يَعۡلَمُ ٱلۡجَهۡرَ مِنَ ٱلۡقَوۡلِ وَيَعۡلَمُ مَا تَكۡتُمُونَ
English translation: Indeed He knows the declared [of] [the] speech and He knows what you conceal
Transliteration: innahu ya'lamu al-jahra mina al-qawli waya'lamu ma taktumuna