وَاِنْكُنْتُمْفِيْرَيْبٍمِّمَّانَزَّلْنَاعَلٰىعَبْدِنَافَأْتُوْابِسُوْرَةٍمِّنْمِّثْلِهٖوَادْعُوْاشُهَدَاۤءَكُمْمِّنْدُوْنِاللّٰهِاِنْكُنْتُمْصٰدِقِيْنَ٢٣
wa‑in kuntum fii raybin mimmaa nazzalnaa 'alaa 'abdinaa fa'tuu bisuuratin min mitslihi wa‑ud'uu syuhadaa‑akum min duuni allaahi in kuntum shaadiqiina
And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. [23]
— Sahih International