– Among his best-known legal opinions—fatwas that stirred no small amount of turmoil and controversy—are:
• his view that expiation is required for an oath that invokes divorce (1);
• his view that a threefold pronouncement of divorce counts as only one divorce (2);
• his view that a divorce pronounced in a forbidden manner does not take effect (3).

He wrote numerous works on these issues, among them:
• a sizeable treatise entitled Taḥqīq al-Furqān bayna al-Taṭlīq wa-l-Aymān (“Establishing the Criterion between Divorce and Oaths”), running to roughly forty fascicles (4);
• a treatise entitled al-Farq al-Mubīn bayna al-Ṭalāq wa-l-Yamīn (“The Clear Distinction between Divorce and an Oath”), at about half that length;
• a treatise arguing that every oath made by Muslims requires expiation, a slim volume;
• a treatise establishing that an oath that invokes divorce is, in fact, a true oath;
• a treatise entitled al-Tafṣīl bayna al-Takfīr wa-l-Taḥlīl (“A Detailed Differentiation between Expiation and Dissolution”) (5);
• and a treatise he called al-Lamʿa (“The Gleam”) (6).