541 - From Mu`adhah bint `Abdullah Al-`Adawiyyah (may Allah have mercy on her): A woman asked `A’ishah (may Allah be pleased with her), saying: “Is it permissible for a menstruating woman to apply henna or dye?” She replied: “We used to be with the Prophet (peace and blessings of Allah be upon him), and we would apply henna, and he did not forbid us from doing so.”.

Commentary : The Shari`ah (Islamic law) came to bring ease to people, especially in matters related to Taharah (ritual purity).
In this Hadith, Mu`adhah bint `Abdullah Al-`Adawiyyah (may Allah have mercy on her) reports: “A woman asked `A’ishah (may Allah be pleased with her), saying: ‘Is it permissible for a menstruating woman to apply henna or dye?’” meaning: is it permissible for her to apply henna to her hands, feet, or hair while she is in a state of menstruation? `A’ishah (may Allah be pleased with her) said: “We used to be with the Prophet (peace and blessings of Allah be upon him), and we would apply henna, and he did not forbid us from doing so.” This indicates that the Prophet (peace and blessings of Allah be upon him) approved of their practice, which serves as evidence of its permissibility. The dye left by henna on the hands does not prevent the removal of major impurity—whether due to Janabah (a state of ritual impurity caused by the discharge of semen or sexual intercourse) and menstruation—through ritual bathing (Ghusl), when they perform it..