What is the ruling when a husband says to a woman who is currently pure (tahir), "If you menstruate one period (haydah), you are divorced"?
Chapter on Explicit Divorce and Others
Al-Mughni
Book of Divorce
Primary text
Divorce does not occur until she menstruates and then becomes pure, because a complete period is not established except through this sequence.
Supporting text
This position is explicitly stated by Ahmad.