以利亚撒是以色列人第一位祭司亚伦的儿子。根据《圣经·旧约全书》民数记第20章所记载，亚伦何珥山上离世之前，把祭司的职位交给以利亚撒。

Eleazar (pronounced /ɛliˈeɪzər/; Hebrew: אֶלְעָזָר, Modern Elʻazar, Tiberian Elʻāzār ; "El has helped") or Elazar was a priest in the Hebrew Bible (or Old Testament), the second Kohen Gadol (High Priest), succeeding his father Aaron after Aaron's death. He was a nephew of Moses.