It was narrated that 'Abdullah bin Az-Zubair said: "A man from Khath'am came to the Messenger of Allah and said: 'My father is an old man who cannot ride, and the command of Allah to perform Hajj has come. Will it be good enough if I perform Hajj on his behalf?' He said: 'Are you the oldest of his children?' He said: 'Yes.' He said: 'Don't you think that if he owed a debt you would pay it off?, He' said: 'Yes.' He said: 'then perform Hajj on his behalf.'''(Daif)