Surah Al-Baqarah 2:23

وَإِن كُنتُمْ فِى رَيْبٍ مِّمَّا نَزَّلْنَا عَلَىٰ عَبْدِنَا فَأْتُوا۟ بِسُورَةٍ مِّن مِّثْلِهِۦ وَٱدْعُوا۟ شُهَدَآءَكُم مِّن دُونِ ٱللَّهِ إِن كُنتُمْ صَـٰدِقِينَ

And if you are in doubt about what We have sent down [i.e., the Qur’ān] upon Our Servant [i.e., Prophet Muḥammad (ﷺ)], then produce a sūrah the like thereof and call upon your witnesses [i.e., supporters] other than Allāh, if you should be truthful.

Translation: Saheeh International

Tafsir

And if you are in doubt in uncertainty concerning what We have revealed to Our servant Muhammad (s) of the Qur’ān that it is from God then bring a sūra like it that is also revealed min mithlihi min is explicative that is a sūra like it in its eloquence fine arrangement and its bestowal of knowledge of the Unseen; …

Excerpt from Tafsir al-Jalalayn, commentary on 2:23, via Quran.com. The reader has the full commentary and 9 more tafsirs.