Who was Abihu?

Father of Him; i. e., “worshipper of God”, the second of the sons of Aaron (Ex. 6:23; Num. 3:2; 26:60; 1 Chr. 6:3). Along with his three brothers he was consecrated to the priest’s office (Ex. 28:1).

Abihu first appears in Exodus 6:23. In this repository’s biblical text, this figure is associated with 12 verse mentions across 4 books, most notably Exodus, Numbers, 1 Chronicles, Leviticus.