Leviticus 10:8

“And the Lord spake unto Aaron, etc.] Because he was a prophet, Aben Ezra says; but the reason rather seems to be, because be was the high priest, and now invested with his office, and in the execution of it, and therefore the following law respecting the priest’s drinking of wine was given: some say, as the same writer observes, that God spake to him by Moses; but it rather seems that he spoke to Aaron immediately: according to Jarchi, this order was delivered to him as a reward for his silence, and to do honour to him on that account: saying; as follows.”

“Do not drink wine nor strong drink--This prohibition, and the accompanying admonitions, following immediately the occurrence of so fatal a catastrophe [Lev 10:1-2], has given rise to an opinion entertained by many, that the two disobedient priests were under the influence of intoxication when they committed the offense which was expiated only by their lives. But such an idea, though the presumption is in its favor, is nothing more than conjecture.”

“10:8-10 The placement of this instruction suggests that Nadab and Abihu were under the influence of alcohol when they offered “the wrong kind of fire” (10:1). Priests were not to drink anything that could impair their judgment before serving in the Tabernacle. • the Lord said to Aaron: God had been communicating only to Moses, but he now accepted Aaron as the people’s representative, and he communicated directly with Aaron as well. • The word common means “secular” or “ordinary.” • ceremonially unclean . . . clean: See 7:19-21; 11:1–15:33.”

“And the Lord spake unto Aaron, saying, Jehovah still further commanded Aaron and his sons not to drink wine and strong drink when they entered the tabernacle to perform service there, on pain of death, as a perpetual statute for their generations ( Exo 12:17), that they might be able to distinguish between the holy and common, the clean and unclean, and also to instruct the children of Israel in all the laws which God had spoken to them through Moses (ו...ו, Lev 10:10 and Lev 10:11, et...et, both...and also). Shecar was an intoxicating drink made of barley and dates or honey. הל, profanus, common, is a wider or more comprehensive notion than טמא, unclean. Everything was common (profane)…”