Eleazar, or Elazar, אלעזר was the son of Aaron.
As a Levite priest, he succeed his father as the second Kohen Gadol.
During the wanderings in Sinai. Eleazer was charged with creating the plating to the altar out of the firepans of Korah's assembly and performing the ritual of the red heifer.
Eleazer was husband of a daughter of Putiel, and father of Phinehas.
Eleazer assisted in the distribution of the land after the conquest of Canaan.
He "was buried at Gibeah, which had been allotted to his son Phinehas in the hill country of Ephraim".
The high-priesthood remained in the family of Eleazar until the time of Eli, a descendant of Ithamar, Eleazar's brother, into whose family it passed.
After Abiathar was cast out by Solomon, the high priesthood was restored to the family of Eleazar in the person of Zadok.
Eleazar is a saint in the Eastern Orthodox Church, and his day is celebrated on September 2.
Eleazer is one of the Holy Forefathers in the Calendar of Saints of the Armenian Apostolic Church, which is celebrated on July 30.