Kapłańska 10:10 Midrasz: Ein Yaakov (Glick Edition) & Sifra

(Fol. 18b) Our Rabbis were taught: (Lev. 15, 31) Thus shall ye separate the children of Israel from their uncleanness. R. Joshua said: "From this you may derive a warning that the children of Israel should separate themselves from their wives near the period of menstruation." And for how long? Said Raba: "For twelve hours" [prior to open period]. R. Jochanan said in the name of R. Simon b. Jochai: "He who does not separate himself from his wife at the said period, even if his children are equal to the sons of Aaron, they will die, for it is written (Ib.) Then ye shall separate the children of Israel from their uncleanness, … and of her that is sick from her impurity, and immediately follows the mention of the death of Aaron's children." R. Chiya b. Acha said in the name of R. Jochanan "He who does separate himself for that period will be rewarded with male children, as it is written (Ib. 11, 47) To make a distinction between the unclean and the clean, and immediately follows (Ib. 12, 2) If a woman … and born a male child." R. Joshua b. Levi added: "He will be rewarded with sons who will be fit to decide law questions, as it is written (Ib. 10, 10-11) So that ye may be able to distinguish … to teach." R. Chiya b. Abba said in the name of R. Jochanan: "Whoever pronounces Habdala over a cup of wine on the eve of Sabbath, will be rewarded with male children, as it is written (Ib. 10, 10) To distinguish, and also (Ib. 11, 17) To make a distinction between, etc., and immediately follows (Ib. 12, 2) If a woman … and born a male child."

8) (Vayikra 10:9) "an everlasting statute throughout your generations": to include (for invalidation of the service after drinking): spillings (of blood), mixings (of wine or oil), wavings (of offerings), presentings (to the altar), (takings of) fistfuls (of meal-offerings), smokings of incense, "pinchings" (of bird offerings), receivings, and sprinklings (of blood). Whence is it derived that if a Cohein officiates after drinking his service is invalid? From (Vayikra 10:10): "So that you distinguish between the holy and the profane." And whence is derived (the invalidity of the service of) a Cohein who officiates lacking one of the priestly vestments or not having laved his hands and his feet? From the identity (gezeirah shavah) of "an everlasting statute" (here) — "for an everlasting statute" (Shemoth 29:9, in respect to the priestly vestments" — "an everlasting statute," (Shemoth 30:21, in respect to laving of hands and feet).

9) (Vayikra 10:10) "so that you distinguish between the holy and the profane": This refers to (inebriation as disqualifying one for) valuations (of animals dedicated to the sanctuary), allotments (for sacred use), and Temple dedications; "and between the unclean and the clean": This refers to (rulings in matters of) uncleanliness and cleanliness; (Vayikra 10:11): "and to teach the children of Israel": These are the teachings (of what is forbidden and what is permitted); "all the statutes": These are the expoundings (of halachoth); "that the L–rd spoke to them": These are the halachoth (spoken to us by Moses but not written in the Torah); "by the hand of Moses": This is Gemara. I might think that it is also forbidden to teach Mishnah (after drinking); it is, therefore, written "and to teach" (halachah), (excluding Mishnah, from which halachah is not taught.)