It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) or Sayyiduna Fadl bin Abbas (may Allah be pleased with him) that a man asked the Noble Prophet (peace and blessings be upon him): O Messenger of Allah! My father is a Muslim, but now he has become so old that he cannot even sit on a mount. So can I perform Hajj on his behalf? The Prophet (peace and blessings be upon him) said: What do you think, if he had a debt and you paid it on his behalf, would it be considered paid for him? He said: Yes. The Prophet (peace and blessings be upon him) said: Then perform Hajj on behalf of your father.