21:20 yusab-biHuunal-layla wan nahaara laa yafturuun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
They say His Purity night and day, and do not slacken.

Yusuf Ali:
They celebrate His praises night and day, nor do they ever flag or intermit.

Pickthal:
They glorify (Him) night and day; they flag not.