Quran 20:7 from Surah Taa-Haa on Divine Marvels.
وَإِن تَجۡهَرۡ بِٱلۡقَوۡلِ فَإِنَّهُۥ يَعۡلَمُ ٱلسِّرَّ وَأَخۡفَى
English translation: And if you speak aloud the word then indeed He knows the secret and the more hidden
Transliteration: wa-in tajhar bil-qawli fa-innahu ya'lamu al-sira wa-akhfa