Quran Al-Hadid 57:6
يُولِجُ ٱلَّيۡلَ فِي ٱلنَّهَارِ وَيُولِجُ ٱلنَّهَارَ فِي ٱلَّيۡلِۚ وَهُوَ عَلِيمُۢ بِذَاتِ ٱلصُّدُورِ ٦
Translation
He causes the night to enter the day and causes the day to enter the night, and He is Knowing of that within the breasts.