Sunan Ibn Majah 1758

It was narrated that Ibn ‘Abbas said:“A woman came to the Prophet (ﷺ) and said: ‘O Messenger of Allah, my sister has died and she owed a fast of two consecutive months.’ He said: ‘Do you not think that if your sister owed a debt, you would pay it off for her?’ She said: ‘Of course.’ He said: ‘The right of Allah is greater.’”