al-Fadl bin Abi Talb Akhw الفضل بن أبي طالب · The Book of Pilgrimage

Messenger of Allah, my father is very old. There is an old obligation of Hajj upon him from Allah, but he is not capable of sitting on the back of the camel. Thereupon Allah's Apostle (ﷺ) said: Perform Hajj on his behalf.