It was narrated from Ibn ‘Abbas that a woman vowed to perform Hajj but she died. Her brother came to the Prophet ﷺ and asked him about that, he said: ‘Do you think that if your sister owed a debt you would pay it off?’ He said: ‘Yes.’ He said: ‘Then fulfill the right of Allah, for He is more deserving that His rights should be fulfilled.” (Sahih)