Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "O Ibn Mas'ud, recite to me." I said: Shall I recite to you when the Qur'an is revealed to you (peace and blessings be upon him)? He said: I began reciting Surah al-Nisa'. When I reached: "How will it be when We bring a witness from every nation, and bring you as a witness against these?" [Surah al-Nisa': 41], then
he (peace and blessings be upon him) said: "That is enough." When I looked at him (peace and blessings be upon him), tears were flowing from both his eyes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21057