Positive commandment · Mitzvat Aseh #75 of 613
Sacrifice of the zavah when she is healed from her discharge
להקריב הזבה קרבן אחר שתטהר
The verse · Vayikra 15:28
וְאִם־טָהֲרָה מִזּוֹבָהּ וְסָפְרָה לָּהּ שִׁבְעַת יָמִים וְאַחַר תִּטְהָר
“But if she be cleansed of her issue, then she shall number to herself seven days, and after that she shall be clean.”
The Rambam’s words
For a zavah to offer a sacrifice when she be-comes purified [after her affliction], as [Leviticus 15:28] states: "When she becomes pure from [the condition] of zavah...."
להקריב הזבה קרבן אחר שתטהר, שנאמר: "ואם טהרה, מזובה" (ויקרא טו,כח).
Who & when
“And it is practiced at the time of the [Temple].”
Where in the Mishneh Torah
Hilchot Offerings for Those with Incomplete Atonement הלכות מחוסרי כפרה