Al Mulk Ayah 13

وَأَسِرُّواْ قَوْلَكُمْ أَوِ ٱجْهَرُواْ بِهِۦٓ‌ۖ إِنَّهُۥ عَلِيمُۢ بِذَاتِ ٱلصُّدُورِ ١٣ Whether you speak secretly or openly—He surely knows best what is ?hidden? in the heart.