People's Dictionary of the Bible
Abihu (a-bî'hew), whose father is He, i.e., God. One of the sons of Aaron, who, together with his brothers, Nadab, Eleazar, and Ithamar, were set apart by God to the office of the priesthood. Soon after they entered upon their sacred duties, Nadab and Abihu were guilty of a violation of God's commands, respecting the manner of offering incense, and they were suddenly destroyed by fire from heaven. They used strange, or common, fire, instead of the sacred fire which they were required to use from the altar of burnt offering. Leviticus 10:1-2. As the prohibition of wine and strong drink, especially when entering into the sanctuary, immediately follows, we may infer that Nadab and Abihu were intoxicated when they fell into this presumptuous sin.
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Rice, Edwin Wilbur, DD. Entry for 'Abihu'. People's Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/rpd/a/abihu.html. 1893.