Sayyiduna Husayn bin Awf (may Allah be pleased with him) narrates: I said: O Messenger of Allah, my father is very old and weak. He has acted upon all the injunctions of Islam except Hajj, and he cannot hold himself steady on a camel. Shall I perform Hajj on behalf of my father? He (peace and blessings be upon him) said: "Tell me, if your father owed a debt, would you pay it off?" I said: Yes. He (peace and blessings be upon him) said: "Then the debt of Allah is more deserving of being paid off."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3537