Who was Eleazar in the Bible

What do you know about Eleazar in the Bible? 

Eleazar was the Third Son of Aaron who served as Israel’s second high priest after the death of his father.
Now the sons of Israel set out from Beeroth Bene-jaakan to Moserah. There Aaron died and there he was buried and Eleazar his son ministered as priest in his place. DEUTERONOMY 10:6 NASB
Wise people learn from the mistakes of others. Eleazar appears to have possessed this ability. When Eleazar became Israel’s second high priest (succeeding his father, Aaron), he took the office with the sound judgment he learned from watching the failures of his father and his brothers. Although his father had served God devotedly, he also failed by betraying his office on two different occasions. Once he jealously opposed Moses (Numbers 12), and another time he led the people into idolatry by building a golden calf (Exodus 32). Then, in Leviticus 10, we read how Eleazar’s older brothers died for their disrespect of God.
While not perfect, Eleazar avoided repeating the mistakes of his father
and brothers as he served God as priest and then as high priest (Numbers
20:25–29). During his twenty years of ministry, he assisted Moses by taking a census (Numbers 26:3) and helping to appoint Joshua to serve as the leader of the people (Numbers 27:18–21). And when Joshua became the Hebrew leader, he helped settle the people in the Promised Land (Joshua 14:1). Eleazar served so faithfully that the high priestly line remained in his family off and on throughout Israel’s monarchy.
The duties of high priest included making an annual atonement for the sins of the entire Hebrew nation. Once a year, on the Day of Atonement, the high priest entered the tabernacle’s Holy of Holies with the people’s offering (Leviticus 16). In addition, the high priest sought God’s will for the people through the use of the Urim and Thummim, which were similar to dice used to cast lots (Numbers 27:21). You can study further about the role of the high priest and the vestments in Exodus 28:2–43, 39:1–31; Numbers 4, 8, and 18.