Hadith No: 2
Al-Nasa'i - al-Sunan al-Kubra - Book of Special Qualities
Mentioning the Station of Ali ibn Abi Talib (may Allah be pleased with him) with Allah, the Mighty and Majestic
Volume: (7) - Page Number: (417)
8355 - Muhammad ibn al-Muthanna narrated to us, who said: Yahya ibn Hammad narrated to us, who said: al-Wadhah narrated to us, he is Abu Uawana, who said: Yahya narrated to us, who said: Amr ibn Maymun narrated to us, that I was sitting with Ibn Abbas when nine men came to him and said: "Will you either stand with us or leave us alone, O you three?" He was in good health that day, before he became blind. He replied: "I will stand with you," and you may talk, but I do not know what they said. Then he came back, shaking off his garment and saying: "Disgrace and outrage! They are speaking ill of a man who has ten (virtues). They are speaking ill of a man about whom the Messenger of Allah (peace be upon him and his holy progeny) said: 'I will surely send a man who loves Allah and His Messenger, and Allah will never humiliate him.'" So, he looked over those who were looking and said: "Where is Ali? He is in the mill, grinding." And none of you would have ground (grain). So, he called him while he was suffering from eye inflammation, hardly able to see. He then breathed into his eyes and shook the banner three times, handing it to him. Ali came with Safiyyah, the daughter of Huyy, and the Prophet (peace be upon him and his holy progeny) sent Abu Bakr with a chapter from Surah At-Tawbah and sent Ali behind him to take it from him, saying: "No one will take it except a man who is from me and I am from him."
And the Messenger of Allah (peace be upon him and his holy progeny) called Hassan, Hussein, Ali, and Fatimah and covered them with a cloak, saying: "O Allah, these are my family. Remove from them any impurity and purify them completely."....