Keri () is a Hebrew term which literally means "accident" or "mishap", and is used as a euphemism for semen emission. Jastrow: קְרִי The term is generally used in Halakha to refer specifically to the regulations and rituals concerning the emission of semen, whether by nocturnal emission, or by sexual activity. A man is said to be a ba'al keri () ("one who has had a seminal emission") after he has ejaculated without yet completing the associated purification requirements.
The Book of Deuteronomy says that a soldier who became impure through a mikreh lailah ("night occurrence") must leave the army camp, immerse, and only return to the camp in the evening. From the word mikreh (מקרה), the rabbis derived the term keri (קרי) to refer to an emission of semen.
In , prior to the revelation at Mount Sinai, Jewish men were warned not "to approach a woman" so as not to become impure.See ;
The Books of Samuel contain two stories which suggest that the laws of seminal emission were observed in that period. In , Saul assumed that David was missing from the royal feast due to having become impure in a mikreh (mishap). In , the priest is willing to distribute holy bread only to those men who have "kept themself from women".Yitzhak Meitles, Parshat Derakhim: Archaeology and Geography in the Weekly Torah Reading, p. 250
Non-traditional biblical scholars see the Leviticus regulations as having originally derived from taboo against contact with semen, because it was considered to house life itself, and was thus thought of as sacred. Peake's commentary on the Bible
The Talmud also described procedures in case a man emitted semen (permissibly or otherwise). It states that one who experienced an emission of semen is required by the Torah to immerse in water in order to be allowed to consume terumah or Korban. It also states that Ezra decreed that one should also immerse in order to be allowed to recite words of Torah, but that Ezra's decree no longer applies nowadays.
Later on, the Rishonim debated whether Ezra's decree still applies in regard to Jewish prayer. Hai GaonBrought in the commentary of Yonah Gerondi on Berakhot and Chananel ben ChushielBrought in say that a ba'al keri, while he may study Torah, may not pray until he goes to a mikveh. Maimonides says that the decree was cancelled entirely and a ba'al keri may even recite the Shema Yisrael,Mishneh Torah, Hilkhot Kriat Shema 4:8 but that the minhag of Shinar (Mesopotamia) and Sepharad (in his day, a term for the Iberian Peninsula) is that before prayer a ba'al keri should wash himself entirely with water.Hilkhot Tefillah 4:6
The modern halakhic consensus is that a ba'al keri is not required to immerse in the mikveh before praying, reciting Shema, saying Berakhah, and so on.Shulchan Aruch, Orach Chaim 88:1 However, some Jews today, including many Hasidic Judaism, practice this immersion because it is considered a praiseworthy practice.
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