51:23 fa wa rab-bis samaai wal arDi in-nahuu laHaq-qum mithla maa an-nakum tanTiquun

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Ahmed Raza Khan: Mohammed Aqib Qadri:
So by oath of the Lord of the heavens and the earth, this Qur'an is the Truth, in the same language that you speak.

Yusuf Ali:
Then, by the Lord of heaven and earth, this is the very Truth, as much as the fact that ye can speak intelligently to each other.

Pickthal:
And by the Lord of the heavens and the earth, it is the truth, even as (it is true) that ye speak.