The Seven-Day Ordination Period is a significant event in the Old Testament, specifically in the consecration of Aaron and his sons as priests. This period is detailed in the Book of Exodus and the Book of Leviticus, where God provides Moses with specific instructions for the ordination of the priesthood, which would serve as mediators between God and the Israelites.

Biblical Foundation

The ordination ceremony is primarily described in Exodus 29 and Leviticus 8. In Exodus 29:35-37 , God commands Moses: "This is what you are to do for Aaron and his sons, according to all I have commanded you. You are to ordain them for seven days. Sacrifice a bull each day as a sin offering to make atonement. Purify the altar by making atonement for it, and anoint it to consecrate it. For seven days you shall make atonement for the altar and consecrate it. Then the altar will be most holy; whatever touches it will be holy."

Ceremonial Elements

The ordination involved several key elements, including sacrifices, anointing, and the wearing of sacred garments. The process began with the washing of Aaron and his sons with water, symbolizing purification (Leviticus 8:6). They were then clothed in priestly garments, which included the ephod, breastpiece, and turban, signifying their new roles and responsibilities (Leviticus 8:7-9).

Anointing with oil was a crucial part of the ceremony, representing the Holy Spirit's empowerment and setting apart for divine service. Leviticus 8:12 states, "He poured some of the anointing oil on Aaron’s head and anointed him to consecrate him."

Sacrificial Offerings

The ordination required specific sacrifices, including a bull for a sin offering, two rams—one for a burnt offering and the other for ordination—and unleavened bread (Exodus 29:1-3). These offerings were essential for atonement, purification, and dedication to God’s service. The sin offering symbolized the removal of sin, while the burnt offering represented complete devotion to God.

Duration and Significance

The seven-day duration of the ordination period underscores the completeness and perfection associated with the number seven in biblical symbolism. This period allowed for a thorough consecration process, ensuring that Aaron and his sons were fully prepared to serve as priests. The ordination not only sanctified the individuals but also the altar and the tabernacle, making them fit for divine worship.

Theological Implications

The Seven-Day Ordination Period highlights the holiness required of those who serve in God’s presence. It emphasizes the need for purification, atonement, and divine calling in the service of the Lord. The ordination of Aaron and his sons established the Aaronic priesthood, which played a central role in Israel’s worship and sacrificial system.

This period also foreshadows the ultimate High Priest, Jesus Christ, who, through His perfect sacrifice, fulfilled and transcended the Old Testament priesthood, offering eternal atonement for sin. As stated in Hebrews 7:27 , "Unlike the other high priests, He does not need to offer daily sacrifices, first for His own sins and then for the sins of the people; He sacrificed for sin once for all when He offered up Himself."

The Seven-Day Ordination Period remains a profound testament to God’s holiness, the seriousness of sin, and the necessity of mediation between God and humanity.