مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1889
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn "Abbas that a woman of Khath’am asked the Messenger of Allah (ﷺ) on the morning of Muzdalifah, when al-Fadl bin ‘Abbas was seated behind him on his mount: Allah has made Hajj obligatory for His slaves when my father is an old man and cannot stay on his mount; do you think that I can do Hajj on his behalf? He said: "Yes."
Musnad Ahmad 1890Sahih (Darussalam) [ al-Bukhari (4399)]