Sahih Bukhari

Narrated Ibn `Abbas:A woman from the tribe of Khath'am came in the year (of ,Hajjat-al-Wada` of the Prophet (ﷺ) ) and said, ""O Allah's Messenger (ﷺ)! My father has come under Allah's obligation of performing Hajj but he is a very old man and cannot sit properly on his Mount. Will the obligation be fulfilled if I perform Hajj on his behalf?"" The Prophet (ﷺ) replied in the affirmative