Sunan an-Nasa'i 5393

It was narrated from 'Abdullah bin 'Abbas that:A man asked the Messenger of Allah [SAW]: "The (command to perform) Hajj has come while my father is an old man and cannot sit firmly in the saddle, and if I tie him, I fear that he may die. Can I perform Hajj on his behalf?" He said: "Do you think that if he owed a debt you would pay it off for him?" He said: "Yes." He said: "Then perform Hajj on behalf of your father