from
Easton's 1897 Bible Dictionary
Ithamar
palm isle, the fourth and youngest son of Aaron (1 Chr. 6:3). He
was consecrated to the priesthood along with his brothers (Ex.
6:23); and after the death of Nadab and Abihu, he and Eleazar
alone discharged the functions of that office (Lev. 10:6, 12;
Num. 3:4). He and his family occupied the position of common
priest till the high priesthood passed into his family in the
person of Eli (1 Kings 2:27), the reasons for which are not
recorded. (See {ZADOK}.)