57:6 yuulijul layla fin nahaari wa yuulijun nahaara fiyl layl* wa huwa 'Aliymum bi dhaatiS Suduur

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Ahmed Raza Khan: Mohammed Aqib Qadri:
He brings the night in a part of the day, and brings the day in a part of the night; and He knows what lies within the hearts.

Yusuf Ali:
He merges Night into Day, and He merges Day into Night; and He has full knowledge of the secrets of (all) hearts.

Pickthal:
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.