﴿ وَأَسِرُّوا۟ قَوْلَكُمْ أَوِ ٱجْهَرُوا۟ بِهِۦٓ ۖ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ ﴾

“AND [know, O men, that] whether you keep your beliefs secret or state them openly, He has full knowledge indeed of all that is in [your] hearts.”

And whether you keep secret O people your speech or proclaim it He indeed exalted be He is Knower of what is in the breasts of what they contain so how much more so is He Knower in the case of what you utter openly — the reason for the revelation of this verse was that the idolaters said to one another ‘Speak secretly and Muhammad’s god will not hear you’.