Jonah
IN THE NAME OF GOD, THE MOST GRACIOUS, THE DISPENSER OF GRACE[10:38]
And yet, they [who are bent on denying the truth] assert, "[Muhammad] has invented it!"
Say [unto them]: "Produce, then, a sūrah of similar merit; and [to this end] call to your aid whomever you can, other than God, if what you say is true!"

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* v.38 : According to the great philologist Abū ‘Ubaydah Ma‘mar ibn al-Muthannā (as quoted by Baghawī), the particle am which introduces this sentence has no interrogative connotation, but is – as in several other places in the Qur’ān – synonymous with the conjunction wa (“and”), which in this case can be suitably rendered as above.
* Cf. 2:23 and the corresponding note 15.