Tafsir of At-Tur 52:34

Let them then produce a recitation like unto it if they are truthful. meaning, if they are truthful in their statement that Muhammad has forged this Qur'an and brought it of his own, then let them produce something similar to what he has brought forth, as in this Qur'an! And even if they combine their strength to that of the people of the earth, Jinns and mankind alike, they will never produce something like the Qur'an, or ten Surahs like it, or even one Surah!