Kur’an 67:13 — sura Al-Mulk, 13. ajet

وَأَسِرُّواْ قَوۡلَكُمۡ أَوِ ٱجۡهَرُواْ بِهِۦٓۖ إِنَّهُۥ عَلِيمُۢ بِذَاتِ ٱلصُّدُورِ

Govorili vi tiho ili glasno – pa, On, sigurno, zna svačije misli!

And conceal your speech or publicize it; indeed, He is Knowing of that within the breasts