The Mishnah on Menstrual Purity and Offerings by Non-Jews

m. Niddah 7:3

All blood stains [on women’s garments] that come from Rekem [biblical Kadesh Barnea] are levitically pure and R. Judah declares them impure because they are converts and are in error.

Those from gentiles are pure.

Those from Israelites and Samaritans, R…