Prophet Muhammad (peace and blessings be upon him) forbade the killing of women. The report about the killing of `Asma bint Marwan upon an order from Prophet Muhammad (peace and blesisngs be upon him) is a fabricated report.

Allah singled out fasting for Himself from all other good deeds, because of its honoured status before Him, because He loves it and because it is a demonstration of sincerity towards Him, as it is a secret between a person and his Lord, which no one can see except Allah.