32. Book of Divorce
    Divorce is of three kinds: the optimal (aḥsan) divorce, the Sunna divorce, and the innovated (bidʿa) divorce.

33. The optimal divorce is for a man to pronounce a single repudiation against his wife during a ṭuhr (period of purity) in which he has not had intercourse with her, and then leave her until her waiting period (ʿidda) ends.

34. The Sunna divorce for a wife with whom intercourse has taken place is to issue three separate repudiations, each in a different ṭuhr.

35. The bidʿa divorce occurs when he pronounces three repudiations in a single statement or three within one ṭuhr. In either case, the divorce takes effect, she becomes irrevocably separated from him, and he is sinful.

Conformity with the Sunna in divorce is considered from two angles:
• Number: regarding the number of repudiations, the rule is the same for a consummated wife and a non-consummated wife alike.
• Timing: regarding the time at which the repudiation is issued, it applies only to a consummated wife, meaning he divorces her in a ṭuhr during which he has not had intercourse with her. As for a wife whose marriage has not been consummated, he may divorce her whether she is in a state of purity or menstruating.

If the woman does not menstruate because of young or advanced age and he wishes to divorce her in accordance with the Sunna, he divorces her once; after one month he divorces her a second time; and after another month he divorces her a third time. It is also permissible for him to divorce her without leaving any interval between intercourse and the divorce.

Divorcing a pregnant woman is permissible immediately after intercourse, and to divorce her according to the Sunna he pronounces three repudiations, spacing each one a month apart.