Surah At-Tur 52:34
فَلْيَأْتُوا۟ بِحَدِيثٍ مِّثْلِهِۦٓ إِن كَانُوا۟ صَـٰدِقِينَ
Then let them produce a statement like it, if they should be truthful.
Translation: Saheeh International
Tafsir
Then let them bring a concocted discourse like it if they are truthful in what they say.
Excerpt from Tafsir al-Jalalayn, commentary on 52:34, via Quran.com. The reader has the full commentary and 9 more tafsirs.