It is prescribed to begin by making up Ramadan before fasting the six days
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Question: A person who owes fasting days from Ramadan and desires to fast six days of Shawwal, and wants to fast them before making up what he owes, on the grounds that the days of Ramadan can be made up at any time, whereas the six days of Shawwal are specific to the month of Shawwal. I ask for your guidance, may Allah reward you.
Answer: It is prescribed to begin with making up the fasts before fasting the six days; because the Messenger of Allah (peace and blessings be upon him) said:Jami` at-Tirmidhi 759Sahih (Darussalam).
And if he fasts them before making up the missed days, he does not achieve following them after Ramadan; rather, he would have fasted them before part of it. And because the obligatory is more important, it takes precedence in being brought forward.
Answer: It is prescribed to begin with making up the fasts before fasting the six days; because the Messenger of Allah (peace and blessings be upon him) said:
Whoever fasts Ramadan, then follows it with six from Shawwal
من صام رمضان ثم أتبعه ستًا من شوالAnd if he fasts them before making up the missed days, he does not achieve following them after Ramadan; rather, he would have fasted them before part of it. And because the obligatory is more important, it takes precedence in being brought forward.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.