Jami` at-Tirmidhi 928
جامع الترمذي#928SahihAl-Fadl bin Abbas narrated:"A woman from Khath'am said: 'O Messenger of Allah! My father has lived until Allah has made Hajj obligatory, and he is an elderly man who is not able to sit on the back of a camel.' So he (pbuh) said: 'Perform Hajj for him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 9:121