The true followers of previous prophets weep in humility when they hear the recitation of the Koran because they know it is the truth from Allah 17:105-110
17:105 We have sent it (the Koran) down with the truth, and with the truth it has come down. We have not sent you except a bearer of glad tidings and a warner,
17:110 Say, 'Call upon Allah, or call upon the Merciful; whichever (Name) you call upon, to Him belong the Most Beautiful Names.' Pray neither loudly nor to quietly, rather, seek a middle course between them.