مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1812
Musnad of al-Fadl bin 'Abbas & narrating from the Prophet
Al-Fadl narrated: I was seated behind the Prophet (ﷺ) on his mount, and a man asked him: My father or mother is very old and cannot do Hajj... and he narrated the same hadeeth.
Musnad Ahmad 1813Sahih hadeeth]