Part of the law given to moses at sinai granted aaron the priesthood for himself and his male descendants, and he became the first high priest of the israelites.[7] levitical priests or kohanim are …We read that “moses was eighty years old, and aaron was eighty-three years old when they spoke to pharaoh,” 1 which tells us that aaron was older than moses by three years.(it also tells us that it is …Aaron was the traditional founder and head of the israelite priesthood, who, with his brother moses, led the israelites out of egypt.The figure of aaron as it is now found in the pentateuch, the first five …