"The priest who is anointed and ordained to succeed his father as high priest is to put on the sacred linen garments." (Leviticus 21:10)
The priests who minister at the altar are held to an additional standard of holiness beyond what is required of ordinary Israelites. They may not defile themselves by contact with the dead except for the closest relatives; they may not shave the edges of their beard or cut their bodies; they must marry a virgin. The high priest may not dishevel his hair or tear his clothes; he may not go near any dead body, even his own father or mother; his wife must be a virgin from his own people. The Catechism draws from this elevated standard the principle of priestly celibacy and the theology of the ordained minister as configured to Christ the Bridegroom who gives himself wholly to the Church (CCC 1579).
A man with a physical defect may not approach the altar to offer the food of God: the blemished priest may eat of the sacred food but may not minister at the altar. This restriction, now entirely superseded in the theology of holy orders, served in its original context to preserve the wholeness of the offering: the priest represents the community before God and his physical integrity signifies the integrity of the worship he mediates. Christ, the unblemished high priest, is the fulfilment of this requirement.
Brothers and sisters, the high priest was called to a standard higher than the people because he stood between them and God. Every position of spiritual leadership carries a corresponding weight of responsibility. Do not take on the ministry of intercession lightly. The standard is higher where the proximity to the holy is greater.
Lord God, you held your priests to a higher standard of holiness because they stood between you and your people. Sanctify your priests today. Give them the integrity of life that the sacred office requires. Through Christ our Lord. Amen.