From Sahih Muslim (Hadith 3252):
Fadl reported that a woman of Banu Khath'am said: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
Reference: Muslim 3252