Abu al-Zanad أبو الزناد · The Book of the Etiquette of Judges

He was riding behind the Messenger of Allah , when a man came and said: "O Messenger of Allah, my mother is an old woman; if I put her on a mount she cannot sit firmly, and if I tie her, I fear that I may kill her." He said: "Do you think that if your mother owed a debt you would pay it off for her?" He said: "Yes." He said: "Then perform Hajj on behalf of your mother."

"A man came to the Prophet and said: 'O Prophet of Allah, my father is an old man and cannot perform Hajj. If I put him on a mount he cannot sit firm. Can I perform Hajj on his behalf?' He said: 'Perform Hajj on behalf of your father.'"