يُولِجُ ٱلَّيْلَ فِى ٱلنَّهَارِ وَيُولِجُ ٱلنَّهَارَ فِى ٱلَّيْلِ ۚ وَهُوَ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
Yooliju allayla fee a l nnah a ri wayooliju a l nnah a ra fee allayi wahuwa AAaleemun bi tha ti a l ss udoor i He makes the night grow longer by shortening the day, and makes the day grow longer by shortening the night; and He has full knowledge of what is in the hearts [of men].
 - Mohammad Asad
He causes the night to pass into the day and the day to pass into the night, and He has knowledge of the inmost secrets of your hearts.
 - Muhammad Farooq-i-Azam Malik
He merges the night into day and the day into night. And He knows best what is 'hidden' in the heart.
 - Mustafa Khattab
He causeth the night to pass into the day, and He causeth the day to pass into the night, and He is Knower of all that is in the breasts.
 - Marmaduke Pickthall
He merges Night into Day and He merges Day into Night; and He has full knowledge of the secrets of (all) hearts.
 - Abdullah Yusuf Ali