Yusuf Ali
And that is indeed a mighty adjuration if ye but knew,-

Sahih International
And indeed, it is an oath - if you could know - [most] great.

Shakir
And most surely it is a very great oath if you only knew;

Pickthall
And lo! that verily is a tremendous oath, if ye but knew -

محمد جالندھری
اور اگر تم سمجھو تو یہ بڑی قسم ہے