Some of famous sayings of the Holy Prophet of Islam(S.A.W.) regarding the uniqueness and magnificence of Imam Ali(A.S.) as recorded in all the authentic Sunni and Shi'ite sources.
"Whomsoever I have authority over,Ali(A.S.) has also authority over him,
O Allah! befriend whoever befriend him and be hostile to whosoever is hostile to him".
"I am the city of knowledge and Ali(A.S.) is the gate."
"Ali(A.S.) is with truth and truth is with Ali(A.S.).They will never separate until they join at the Pool of Kawthar in the Hereafter"
"Every prophet has a vicegerent and inheritor and Ali(A.S.) is my vicegerent and inheritor."
"You[Ali(A.S.)] are to me as Aaron unto Moses,only there is no prophet after me."
"Only the faithful believer will love you and only hypocrites will hate you."
Birth of Ali(A.S.) in the Holy Kaaba
Hazrat Ali(A.S,) was born in the Holy Kaaba at Mecca on Friday, the 13th day of Rajab, 600 A.D. Both the Holy Prophet (S.A.W.) and Hazrat Ali(A.S.) belonged to the same clan. They were Hashimites, the clan of Bani Hashim. Muhammad's(S.A.W.) father was Abdullah, and that of Hazrat Ali(A.S.), Abu Talib. They were brothers and their father was Abdul Muttalib. Thus the Holy Prophet(S.A.W.) and Hazrat Ali(A.S.) were cousins. Hazrat Ali(A.S.) had two brothers, Ja'far and Aquil.