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Abihu was the second son of Aaron the Priest and his wife Elisheba, and the nephew of Nahshon, leader of the tribe of Judah (Exodus 6:23; Numbers 2:3). Abihu went with the seventy elders of Israel when they went with Moses and saw the God of Israel (Exodus 24.9-11). Abihu served as a priest under his father. He is most notable because he offered before God "strange fire" (incense that was not according to the Law's specification) with his older brother Nadab (Leviticus 10.1). When he offered this incense God sent forth a fire that utterly consumed both Nadab and Abihu. Aaron was commanded not to mourn at all for his sons, who were justly executed for disobeying the commandment of God.
In Hebrew his name is אביהוא [’Abiyhuw’ / ab·ee·hoo]. This is a compound word meaning, "He is my father," or more literally, "My father is he." It comes from the words אבי (my father) and הוא (Third Masculine Singular Pronoun: he).