Islamic sources indicate that Muslims often sought to distance themselves from the Rabbinic Jewish laws of menstruation. A study of Islamic folklore on menstruation demonstrates that Muslim authors have adopted Jewish Midrashim on the subject, with certain alterations. In the following article, I will attempt to examine several Midrashic sources regarding menstruation that may have been absorbed into some Islamic sources. I will further seek to explain the differences between the Jewish and Islamic texts.
Haggai Mazuz“Menstruation and Differentiation: How Muslims Differentiated Themselves from Jews Regarding the Laws of Menstruation,”Der Islam87 (2012) 204-223. In addition a forthcoming monograph will examine how Jewish Rabbinical sources influenced Islamic law on the subject of menstruation. See Haggai Mazuz Menstruation and Its Legislation: The Evolution and Crystallization of the Law of Menses in the Islamic Juristic Tradition. With an introduction by Moshe Sharon (Ramat-Gan: Bar-Ilan University Press forthcoming) [in Hebrew]. Its thesis is that the evolution of most Islamic laws relating to menstruation was the result of applying the principle of mukhālafa. Islamic sources indicate that Muslims often deliberately rejected the practices of Jews Christians and Zoroastrians. In Islamic legal sources this principle is called mukhālafa.