﴿ وَإِن تَجْهَرْ بِٱلْقَوْلِ فَإِنَّهُۥ يَعْلَمُ ٱلسِّرَّ وَأَخْفَى ﴾

“And if thou say anything aloud, [He hears it] since, behold, He knows [even] the secret [thoughts of man] as well as all that is yet more hidden [within him].”

Please check ayah 20:8 for complete tafsir.