When they could not respond, Allah said: (And if they answer not your prayer) and if the wrong-doers do not answer you, (then know) O disbelievers (that it is revealed) that Gabriel brought down the Qur'an (only in the knowledge of Allah) and with his command; (and that there is no God save Him. Will ye then be (of) those who surrender?) and believe in Muhammad (pbuh) and in the Qur'an.