Who did, precisely ...?
Fake Messiah alluded above to myths and legends that existed before Islam. Recall that Muhammad actively challenged people with the Qur'an, and they had good incentive to respond to his challenge. Given that there were, indeed, myths and legends from the ancients, his contemporaries had enough ammunition to discredit his claims, yet nobody did.
Maybe they simply knew they were wrong, and that he was right.
Fake Messiah alluded above to myths and legends that existed before Islam. Recall that Muhammad actively challenged people with the Qur'an, and they had good incentive to respond to his challenge. Given that there were, indeed, myths and legends from the ancients, his contemporaries had enough ammunition to discredit his claims, yet nobody did.
Maybe they simply knew they were wrong, and that he was right.