The most expeditious way to clear one's conscience is to make up the fasts of Ramadan before fasting the six days of Shawwal

Question:
May Allah reward you with good and do you well. She says: I love fasting the six days of Shawwal and the first ten days of Dhu al-Hijjah. As soon as Ramadan ends, I start fasting the six days of Shawwal and postpone making up the missed fasts until after the six days, so that Shawwal does not end before I have fasted the six. Then, after that, I think about making up the missed fasts. Is it permissible for a person to fast the six days before making up what he owes? May Allah reward you with good.

Answer:
The better and more cautious course is for a person to start with making up the fasts, if he has any missed fasts from Ramadan. The better and more cautious course for him is to begin with them before fasting voluntarily, before the six days and any other voluntary fasting, in order to clear his conscience. This is especially so because the Prophet (peace and blessings be upon him) said regarding the six days: . The apparent meaning of the hadith is that one who has missed fasts to make up does not fast the six days of Shawwal until he has made them up, so that it is true of him that he fasted Ramadan and then followed it with the six days of Shawwal. In any case, the precaution and the most expeditious way to clear one's conscience is to make up the fasts before the six days. The month is long, and praise be to Allah, she can make up the fasts that are due from her and then fast the six days after that. Yes.