Sunan An-Nasa'i

(It was narrated from 'Abdullah bin 'Abbas that:a man asked the Prophet ""The command of ) Hajj has come while my father is an old man and cannot sit firmly in his saddle; if I tie him (to the saddle) I fear that he will die. Can I perform Hajj on his behalf?"" He said: ""don't you think that if your father owed a debt and you paid it off, that would be good enough?"" He said: ""Yes."" He said: ""Then perform Hajj on behalf of your father