Does the reward of voluntary fasting reach the deceased?

Question:
May Allah reward you, Honorable Shaykh. This questioner asks: Does the reward of voluntary fasting reach the deceased? And are there any acts of devotion

Answer:
No, unless it is fasting for a vow. Yes, in the hadith and if he had a vow of fasting, his guardian fasts on his behalf. So if the fast is a vow, yes, it benefits the deceased and clears his liability. As for anything other than a vow, it does not benefit him; because fasting is a physical act, it is like prayer, and representation does not apply to it. But the vow, because the person obligated himself to it, whereas what Allah obligated upon him, like prayer and fasting, representation does not apply to it. Yes.