Musnad Abu Ya'la al-Mawsili 110:24

Khalf ibn Hisham al-Bazzar narrated to us, Abu al-Ahwas narrated to us, from Simak, from Ikrimah, from Ibn Abbas, who said: A man came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, my father is a very old man who cannot perform Hajj; shall I perform Hajj on his behalf?" He said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Yes, so perform Hajj in place of your father."