Sefer HaMitzvot, Positive Commandments
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היא שצונו שיקריב קרבן כל איש זב שנתרפא מזובו וזהו קרבן הזב, והוא מחוסר כפרה עד שיקריבהו, והוא אמרו יתעלה ויתברך שמו וכי יטהר הזב מזובו וביום השמיני יקח לו שתי תורים. (זאת תהיה, מחוסרי כפרה פ"א גם פ"ב וג'):
That is that He commanded us that any man who is healed from a discharge offer a sacrifice. And this is the sacrifice of the zav; and he is lacking [full] atonement until he offers it. And that is His, may He be exalted and may His name be blessed, saying, "When one with a discharge becomes clean of his discharge [...]. On the eighth day he shall take two turtledoves" (Leviticus 15:13-14). (See Parashat Metzora; Mishneh Torah, Offerings for Those with Incomplete Atonement 1-3.)