Aaron אהרן הכהן
the first High Priest, Moshe's elder brother
Aharon was born in 2365, three years before Moshe. When Moshe refuses the mission, pleading a heavy tongue, God answers: «There is Aharon your brother… and when he sees you he will rejoice in his heart.» The sages note that the elder brother whose primacy is taken rejoices — and for that wears the breastplate with the tribes' names over his heart.
He speaks to Pharaoh, raises the staff over Egypt's waters, and with Chur holds up Moshe's hands against Amalek. In the affair of the golden calf he plays a passive part, trying to gain time; the Torah does not hide it, nor does it strip him of his office.
With the Mishkan he becomes High Priest. On the very first day of service his sons Nadav and Avihu die, and of him the Torah says only: «And Aharon was silent.»
Hillel formulates his image in Avot: «Be of the disciples of Aharon — loving peace and pursuing peace, loving people and drawing them near to Torah.» He died on 1 Av 2487, aged 123.