"This list is introduced by the expression "And the LORD spoke to Moses saying, Speak to Aaron" ( Leviticus 21:16), and is concluded by the expression "And Moses spoke to Aaron" ( Leviticus 21:24). There are fourteen (7 x2) laws in the list." [1][source]
Certain restrictions applied to priests who were physically defective. They could not enter the holy place or offer sacrifices at the altar of burnt offerings. Physically inferior priests were not necessarily inferior spiritually, but the priest"s duties and office required completeness since the priest stood between God and people. [source][source][source]
". . . the priests can be most effective in God"s service only when they are in ordinary health and free from physical imperfections." [2][source]
The priests" physical condition also had to display the perfection of God"s creation, just like the animal sacrifices. Physical wholeness symbolized spiritual holiness. [source][source][source]