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Positive commandment · Mitzvat Aseh #99 of 613

For [a woman in the] niddah state to be impure and to impart impurity to others

להיות הנידה טמאה ומטמאה לאחרים

Parashat Metzora מצרע · Sefer HaChinuch #181

The verse · Vayikra 15:19

וְאִשָּׁה כִּי־תִהְיֶה זָבָה דָּם יִהְיֶה זֹבָהּ בִּבְשָׂרָהּ שִׁבְעַת יָמִים תִּהְיֶה בְנִדָּתָהּ וְכׇל־הַנֹּגֵעַ בָּהּ יִטְמָא עַד־הָעָרֶב

“And if a woman have an issue, and her issue in her flesh be blood, she shall be seven days in her menstrual separation: and whoever touches her shall be unclean until evening.”

Read Vayikra 15:19 in context on Sefaria

The Rambam’s words

For [a woman in the] niddah state to be impure and to impart impurity to others.

להיות הנידה טמאה ומטמאה לאחרים.

Who & when

“And [it] is practiced in every place and at all times.”

Where in the Mishneh Torah

Hilchot Those Who Defile Bed or Seat הלכות מטמאי משכב ומושב

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