Al Hadid Ayah 6

يُولِجُ ٱلَّيْلَ فِى ٱلنَّهَارِ وَيُولِجُ ٱلنَّهَارَ فِى ٱلَّيْلِ‌ۚ وَهُوَ عَلِيمُۢ بِذَاتِ ٱلصُّدُورِ ٦ He merges the night into day and the day into night. And He knows best what is ?hidden? in the heart.