Sunan An-Nasa'i

It was narrated from Al-Fadl bin 'Abbas, that:He was riding behind the Messenger of Allah [SAW], when a man came and said: ""O Messenger of Allah, my mother is an old woman; if I put her on a mount she cannot sit firmly, and if I tie her, I fear that I may kill her."" He said: ""Do you think that if your mother owed a debt you would pay it off for her?"" He said: ""Yes."" He said: ""Then perform Hajj on behalf of your mother