Le Lévitique 15:2 Références du Talmud : Jerusalem Talmud Nazir, Jerusalem Talmud Shabbat & Megillah

MISHNAH: Any person with initially doubtful skin disease is pure as long as he was not declared impure. After he was declared impure, in doubt he is impure¹⁴⁵A sufferer from skin disease is impure only after he was declared impure by a Cohen. Once he is impure, he can regain purity only by a ceremony administered by a Cohen. A Cohen may not declare a person impure unless the impurity is clearly demonstrated; he may not cleanse a person declared impure unless that person is clearly healed. The details are given in Mishnah Nega‘im 5:4–5.. ¹⁴⁶The Mishnah is given in great detail in Zavim 2:2; it is included here only because it is a “not unsubstantiated” case. In seven ways does one check the sufferer from a genital discharge before he becomes impure¹⁴⁷The basic source is Lev. 15:1–15. After a discharge of semen, a male is impure for the rest of the day (Lev. 15:16). For any other discharge, the first time he is pure. After the second discharge within 24 hours he is impure for seven days. However, if there is a reason to suspect that the discharge was induced by an outside cause, he remains pure since impurity is created by (Lev. 15:2) “flow from his flesh”, not from any outside cause. After the third discharge, he needs purification by a sacrifice.: About eating and drinking¹⁴⁸If he ate or drank excessively., carrying a load or jumping¹⁴⁹Extraordinary physical exertion, whether professional or for sport., sickness, looking, and thought¹⁵⁰Looking at women might cause an ejaculation as well as thinking of copulation.. After he becomes impure one does not check him; his accident, doubtful case, and semen are impure since the matter is not unsubstantiated¹⁵¹Once he is suffering from gonorrhea, any discharge is ascribed to his condition rather than to extraneous influences..

Their semen. But did not Rebbi Aḥa, Rebbi Ḥinena say in the name of Rebbi Joḥanan, a Gentile’s semen is pure for semen cannot be discharged without urine³³³Since the rules of impurity of genital discharges were given only to the “children of Israel” (Lev. 15:2). Any purity imputed to Gentiles must be rabbinic only; Babli Niddah 34a..

From where is this rule derived? As our Rabbis have taught: R. Simai says: The text counted two [issues] and designated the man as unclean, and then three and designated him as unclean. How so? Two for uncleanness, a third for a sacrifice.