Musnad Ahmad 25:351

Yunus narrated to us, Hammad—meaning Ibn Zayd—narrated to us, from Abu al-Tayyah, from Musa ibn Salamah, who said: I went out, and Sinan ibn Salamah went out, and we had two sacrificial camels with us. They became exhausted on the road, so Sinan said to me: "Do you want to go to Ibn Abbas?" We came to him, and Sinan asked him, and he mentioned the hadith. He said: Ibn Abbas said: A Juhani man asked the Messenger of Allah, peace and blessings of Allah be upon him, and said: "O Messenger of Allah, my father is a very old man who has not performed Hajj." He said: "Perform Hajj on behalf of your father."