Sunan An-Nasa'i

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