Sahih Bukhari Volume 006, Book 061, Hadith Number 575.
Narrated By 'Abdullah (bin Mas'ud) : Allah's Apostle said (to me), "Recite the Qur'an to me." I said, "Shall I recite (it) to you while it has been revealed to you?" He said, "I like to hear it from another person." So I recited Surat An-Nisa (The Women) till I reached the Verse: 'How (will it be) then when We bring from each nation a witness, and We bring you (O Muhammad) as a witness against these people.' (4.41) Then he said to me, "Stop!" Thereupon I saw his eyes overflowing with tears.