The Messenger of Allah ﷺ also said:

“Whoever approaches a menstruating woman, or has intercourse with a woman through her anus, or visits a fortune-teller and believes what he says, has disbelieved in what was sent down to Muhammad ﷺ.”

The authors of the Sunan collections narrate this ḥadīth with an authentic chain, as clarified in Naqd al-Tāj (64).

There is unanimous agreement that intercourse with a menstruating woman is forbidden. Based on this ḥadīth, Aḥmad ibn Ḥanbal, Muḥammad ibn al-Ḥasan, Isḥāq, and others held that other kinds of marital intimacy remain permissible, though it is disliked for anyone who fears that he may fall into the prohibited act, as a precautionary measure that blocks the means to sin.

If a man nevertheless has intercourse with his wife during her menses, he should give in charity either one dinar or half a dinar, at his discretion. Ibn ʿAbbās relates that the Prophet ﷺ said concerning a man who approaches his wife while she is menstruating: “Let him give in charity a dinar or half a dinar.” The compilers of the Sunan transmit this report with a sound chain. The eminent scholar Aḥmad Muḥammad Shākir devoted a lengthy study to its chains—authenticating some of them—in his notes on al-Tirmidhī (1/246–254).

During menstruation a woman neither prays nor fasts. The Prophet ﷺ said to the women, “Is not a woman’s testimony equal to half the testimony of a man?” They replied, “Yes.” He said, “That is because of the deficiency in her intellect. And is it not the case that when she menstruates she neither prays nor fasts?” They replied, “Yes.” He said, “That is the deficiency in her religion.” Reported by al-Bukhārī.

She must, however, make up the missed fasts but not the missed prayers. Muʿādhah (may Allah have mercy on her) said, “I asked…"