Setting
1- :
2- Whoever dies while still having some fasts to make up for, his heir should fast on his behalf
3- O Messenger of Allah, my mother has died in a state that she had to observe the fast of a month. Should I complete it on her behalf? Thereupon he said: Would you not pay the debt if your mother had died without paying it? He said: Yes. He said: The debt of Allah is more worthy of being repaid