50:40 wa minal layli fa sab-biHhu wa adbaaras sujuud

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Ahmed Raza Khan: Mohammed Aqib Qadri:
And say His Purity during the night, and after the customary prayers.

Yusuf Ali:
And during part of the night, (also,) celebrate His praises, and (so likewise) after the postures of adoration.

Pickthal:
And in the night-time hymn His praise, and after the (prescribed) prostrations.