'Abdullãh ibne-Mas'úd (Ra) narrates that Rasúlullãh (saw) asked me to recite the Qur'ãn; I submitted: Shall I recite the Qur'ãn to you while it has been revealed to you? He said: I like to hear it from someone else. So, I recited to him Súrah An-Nisa. When I came to the Verse:

So how will it be with them, when We bring of every people a witness; and We shall bring you O Muhammad, a witness against these people i.e. your Ummah.

He said: Stop, I saw tears were rolling from his eyes.

(Bukhãrí)