سورة At-Tur 52:34

فَلْيَأْتُوا۟ بِحَدِيثٍۢ مِّثْلِهِۦٓ إِن كَانُوا۟ صَـٰدِقِينَ ٣٤

Let them then produce something like it, if what they say is true