AARON:

• The son of Amram and the brother of Moses and Miriam.
• The meaning of the name ―Aaron is uncertain, although it is perhaps derived from Egyptian. 
• Aaron is chosen above the others to be a High priest (Ps 105:26, Ps 106:16) and to have access to the holy things (1 Chr 23:13) in the Temple (1 Chr 24:19) or the tent of meeting (Exod 27:21, Num 17:1–5)
• He dies at Mount Hur (Deut 32:50) and is succeeded by his son Eleazar (Num 20:22–29).

There are 346 references to Aaron in the Hebrew Bible (several in the Apocrypha and Pseudepigrapha and 5 in the New Testament).

A vast majority (296) appears in Exodus, Leviticus, and Numbers.

Deuteronomy (4), Joshua (6), Judges (1), 1 Samuel (2), Micah (1), Psalms (9), Ezra (1), Nehemiah (3), 1 Chronicles (16), and Chronicles (7).

 Children of Aaron referred in Bible:

As "sons of Aaron": 

Lev 3:8; 21:1; Num 10:8; Josh 21:4; 1 Chr 24:1; Neh 12:47

 As "belonging to Aaron" 

1 Chr 12:28

Job duties: Aaron and his sons are set apart to perform the most sacred duties, oversee all priestly functions and groups. They monitor the priests' activities at both the Temple and the tabernacle. Perform the rituals, handle the sacred objects and are permitted to enter the holiest of places. He and his sons make sacrifices, offerings, and atonement in the holiest site in the Temple (1 Chr 6:34). The same standards of purity apply to the Aaronites themselves. They are to be without blemish and pure in all ways (Leviticus 21).

• To serve Yahweh as priests (Exod 28:1)
• To wear priestly garments (Exod 28:3–43) 
• To be consecrated to Yahweh (Exod 29:1)
• To be ordained (Exod 29:9, 35)
• To teach the people Yahweh's statutes 
• Perform burnt offering (Lev 1:3–17; 9:12–14)
• Perform cereal offering (Lev 2:1– 16)
• Perform peace offering (Lev 3:1–17; 9:18–21).
• Perform sin offering (Lev 4:1–5:13) 
• Perform guilt offering (Lev 5:14–26 )
• In charge during the offering of atonement (Leviticus 16).
• To burn incense, to minister, and to bless (1 Chr 23:13; 24:19). 
• Tend the tent of meeting (Exod 27:21)
• Perform the distinction and Explain people(Lev 11:1) between clean and unclean (Leviticus 11–14)
• Examine people diseased (Lev 13:1–2).
• Examine unclean houses and explain to people how to cleanse them (Lev 14:33– 57).

Individual Responsibilities:

• To maintain the holy status of the priests.
• Should not become defiled by sexual acts, violation of laws, or marrying a divorced woman.
• Should keep Yahweh's laws (Ezek 44:24).
• Should Not let one's hair hang loose (Leviticus 21: 10).
• Should not come in contact with a dead body (Leviticus 21:11). 
• The priest with a blemish should not offer bread to Yahweh (Leviticus 21: 18).
• Should avoid drinking wine/alcohol or other drinks when going into the tent of meeting.
• Should act as judge (Ezek 44:24; Exod 28:29–30), Distinguish between the holy and the common and between the clean and the unclean. 

Ordination: 

Hebrew meaning for ordination word means "whose hands are filled ." Hebrew word: ml˒ yd lkhn], ―to fill the hand, is the common Hebrew expression used to indicate ordination. Num 3:2–3 Aaron's sons are listed and identified as anointed priests ―ordained to minister in the priest's office.

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• Aaron and his sons shall be anointed and consecrated as priests of Yahweh with ―holy oil (Exod 30:30–31) 
• A bull and two rams are to be sacrificed in Aaron's honour (Exod 29:10–37). 

Urim and Thummim: In Num 27:21, it is Eleazar, the son of Aaron, the next in the priestly line (Num 20:22–29), who uses the Urim to inquire whether Joshua should succeed Moses. The Urim and Thummim are thus symbols of special access to God's will. According to parts of the biblical tradition, they belong in the hands of the Aaronites.

• The Aaronites are given the Urim and Thummim (Exod 28:30, Lev 8:5–9), which are used to determine the will of Yahweh (Num 27:21; 1 Sam 14:36–42, 27:6; 1 Sam 10:20–24). 
• It indicates the juridical role of Aaron (Exod 28:29–30a; cf. Ezek 44:24).

Aarons Rod:

• Aaron's rod becomes the serpent (Exod 7:10), 
• Swallows the rods of Pharaoh's magicians (Exod 7:12), 
• Turn the Nile into blood (Exod 7:19), 
• Causes the plague of frogs (Exod 8:1-5), 
• Plague of gnats (Exod 8:16–17). 

 Relationship between Aaron and Moses:

• Aaron is Moses‘ brother (Exod 4:14; 6:20; 28:1; Num 26:59; 27:12–13; Deut 32:50; 1 Chr 5:29)
• Moses and Aaron is a common theme in the first five books(Pentateuch) Josh 24:5; 1 Sam 12:6; Ps 77:21.
• 65 instances where the phrase ―"Moses and Aaron" appears, almost like a word pair
•  word pair ―"Aaron and Moses" occurs twice (Exod 6:26; Num 3:1)
• Yahweh speaks to Moses, who in turn speaks to Aaron (Exod 7:19; 16:32–34; Lev 17:1–2; Num 6:22–23; 8:1–2)
• Yahweh speaks to Moses and Aaron at the same time (Exod 12:43; Lev 11:1; 14:33; Num 2:1; 19:1; 20:12).
• Yahweh speaks directly to Aaron (Lev 10:8; Num 18:1).

 Relationship between Aaron and other Zadokites Groups:

• Three priestly groups have a significant role in the Bible: the Aaronites, Zadokites and the Levites.
• Zadok is a descendant of Eleazar, the son of Aaron, and Abiathar is a descendant of Ithamar, also a son of Aaron.
• Zadokites played a prominent role in the priesthood in the later stages, and little is said about the Aaronites.
• References to Aaron or Aaronites occurred only twice, in Kings and Samuel and 26 references to Zadok as the priest.
• Relationship of Zadok and Abiathar, the two priests of David (2 Sam 8:17, cf. 1 Sam 22:20) who are rivals after his death.
• At the end of David's reign, there is a conflict over the succession to the throne. Solomon and his followers and Adonijah and his followers (1 Kings 1–2). Solomon appoints Zadok as the priest of the Temple and expels Abiathar (1 Kings 2:27), the associate of Adonijah. 
• Zadok and his followers, the Zadokites, are priests in good standing.
• In the book of Ezekiel, he never mentions the Aaronites. it is the Zadokites with the help of the Levites who are the priests (Ezek 40:46; 44:15; 48:11).

Relationship between Aaron and Levites Groups:

• For punishment for those involved in idolatry (Exod 32:25–29). Moses calls for those ―on Yahweh's side to join him in opposition to the people who ―broke loose. 
• Levites respond to Moses' call and slay 3,000 people who participated in the idolatry. As a result of the Levites' actions, they are ―"ordained" to the service of Yahweh (Exod 32:29). The Hebrew text says ―their hands are filled, which is a clear reference to their ordination as priests.
•  In 1 Kings 12. Jeroboam establishes two centers in the Northern Kingdom at Dan and Bethel (1 Kings 12: 25–33), and makes two calves of gold for these centers (1 Kings 12: 28). Jeroboam erects these calves and declares, ―Behold your gods, O Israel, who brought you out of the land of Egypt, the same phrase as was used by Aaron in Exod 32:4. Jeroboam selects priests for these Temples. He explicitly excludes Levites (1 Kgs 12:31). (According to 2 Chr 13:8–9, Jeroboam excludes both Levites and Aaronites).
• A common inference on the two golden calf incidents of Exodus 32 and 1 Kings 12
•  The two eldest sons of Aaron and the sons of Jeroboam have the same names: Nadab and Abihu for Aaron (Exod 6:23) and Nadab and Abijah for Jeroboam (1 Kgs 14:1, 20). And all four of these sons die due to their idolatry ( Leviticus 10; 1Kings 14:1–14; 15:25–30).

Negative points:

• Construction of the GOLDEN CALF (Exodus 32)
• Aaron is portrayed as the villain, who receives the gold from the people (Exod 32:4a), makes the calf (Exod 32:4a, 35). Aaron declares, ―"These are your gods, O Israel, who brought you out of the land of Egypt!" (Exod 32:4) and builds an altar before the calf (Exod 32:5). 
• Aaron has brought a great sin upon the people (Exod 32:21) and has allowed the people to ―break loose (Exod 32:25). In contrast, Aaron seeks to redirect Moses' anger (Exod 32:22–24). 
• Joins Miriam in opposing Moses (Numbers 12).

Positive points:

Officially ordained priest of God and has a lot of reflection as High priest to Jesus Christ our Lord, which will be posted in the following article. 

Jesus the High Priest:

• Aaron and the Aaronites play a prominent role as priests. In the New Testament, the book of Hebrews speaks of Jesus being called by God, just like Aaron (Heb 5:4–5). 
• To distinguish Jesus from the priests of all time, Jesus is of the order of Melchizedek, not that of Aaron and the Levites (Heb 7:4–22). 
• Thus the writer of Hebrews claims a priestly authority for Jesus, which comes through Melchizedek at the time of Abraham (Gen 14:17–24; Ps 110:4; Heb 7:1–3).