His statement
عليه السلام: "Her breaking of the fast is due to the blood" means that even if she does not break her fast with food and drink, she is still considered as one who has broken her fast. And then: "It is prohibited for her husband to have intercourse with her until she exits her menstrual state." This is supported by the verse in the Quran: "And they ask you about menstruation. Say, 'It is harm, so keep away from women during menstruation. Do not approach them until they are pure.'" (Surah Al-Baqarah
2:222). This wording explicitly prohibits approaching them and mandates abstaining until they are pure. It is further evidenced as well.
Commentary #3