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.
The Saheeh International Quran Translation
يُولِجُ ٱلَّيْلَ فِى ٱلنَّهَارِ وَيُولِجُ ٱلنَّهَارَ فِى ٱلَّيْلِ وَهُوَ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِHe causes the night to enter the day and causes the day to enter the night, and he is Knowing of that within the breasts.