Jabir bin Abdullah, may Allah be pleased with him, reports that when Ali, may Allah be pleased with him, finished collecting the charities and came (to Mecca), the Prophet, peace and blessings be upon him, asked him: "O Ali! For what have you entered into Ihram?" He replied: "For that which the Prophet, peace and blessings be upon him, has entered into Ihram." The Prophet, peace and blessings be upon him, said: "Then offer a sacrifice, and remain in your state of Ihram."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 798
Hadith Takhrijاخرجه البخاري، الحج، باب من اهل في زمن النبي صلی اللہ علیہ وسلم كاهلال النبي صلی اللہ علیہ وسلم (1557) ، (1558) ، (2005) ، (2506) ومسلم ، الحج، باب بيان وجوه الاحرام وأنه يجوز افراد الحج..... الخ (1216)۔