Q: What is
the wisdom behind making up for Sawm (Fasts) and not for Salah (Prayers) missed during menstruation?
All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.
First: It is the obvious duty of every Muslim to obey the Commands of Allah and avoid all that which He has forbidden; whether or not they perceive the wisdom behind the command or prohibition, while believing that Allah does not command or prohibit anything but for the own good of His Slaves. All the Laws of Allah (Exalted be He) have wisdom behind them, only known to Him, of which He reveals to His Slaves what He wills, for believers to increase thereby in Iman (faith); or keeps the wisdom behind them hidden, for believers to increase in submission to His Commands, and obey out of faith in Him.
It is known that there are Five Obligatory Daily Prayers enjoined to be performed during the day and night, which will be difficult for a menstruating woman to make up for. On the other hand, Sawm is due once a year and menstruation may last for a day or two only. Indeed, truthful are the Words of Allah, Almighty, Who says (what means):
Allâh wishes to lighten (the burden) for you; and man was created weak (cannot be patient to leave sexual intercourse with woman).
(Part No. 5; Page No. 398) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.