question #1 Sahih Muslim 1148a, Book 13, Hadith 199 : What is the significance of fulfilling religious obligations on behalf of deceased family members in Islam?

A woman came to the Messenger of Allah (ﷺ) and said: My mother has died, and fasts of a month are due from her. Thereupon he said: Don’t you see that if debt was due from her, would you not pay it? She said: Yes (I would pay on her behalf). Thereupon he said: The debt of Allah deserves its payment more than (the payment of anyone else).