Is it valid to suspend the intention of fasting until purity from menstruation, knowing that blood and brownish discharge may return after seeing dryness, and that the brownish discharge may not appear until just before or after sunset? What is the latest time for ghusl (ritual bath) for the fast to be valid?

A woman knows that she has become pure by two signs: dryness or the white discharge. As soon as she sees either of them, she must hasten to perform ghusl to perform acts of worship. Delaying ghusl is a sin because it leads to missing prayers, and she must make up for what she missed. The fast of the day on which she delayed ghusl is valid.

If blood, yellowish discharge, or brownish discharge returns to the woman during her menstrual period, she is considered to be menstruating again, and she must repeat ghusl after its cessation. However, if it returns after she has completed her fast, her fast is valid.

There is no time limit for performing ghusl after menstruation. A woman must perform ghusl as soon as she sees purity. Ghusl is not a condition for the validity of the fast.

If a woman becomes pure at night and intends to fast, and she intends to break her fast if she menstruates, this does not harm her.

If a woman becomes pure at night and intends to fast, then blood returns to her during the day, her fast for that day is invalidated, and she must make it up.

If a woman intends at night that if she wakes up pure, she will fast, this is sufficient for her if it is her habit for the blood to stop at that time.