A woman from Khath'am said: "O Messenger of Allah, the command of Allah, the Mighty and Sublime, to His slaves to perform Hajj has come while my father is an old man, and he cannot sit upright in the saddle. Will it discharge his duty if I perform Hajj on his behalf?" The Messenger of Allah turned Al-Fadl's face to the other side.
Sunan an-Nasa'i Book 49, Hadith 14