God spoke to Moses: “Speak to the priests, the sons of Aaron.” Moses gathered them near the Tabernacle and explained that their work was special, so they had extra rules. A priest was not to make himself impure by contact with a dead body, except for close relatives, mother, father, son, daughter, brother, or an unmarried sister. They also could not shave their heads smooth, cut the edges of their beards, or make cuts in their skin.
Because they brought offerings, they had to guard what was holy. They were not to marry a woman known for prostitution or a divorced woman. The high priest had even stricter rules and could marry only a virgin.
God also said that a priest with a physical defect could not serve at the altar, though he could still eat the sacred food. Priests had to be careful with sacred donations: if they were impure, they waited until evening after washing. Most other people could not eat this food, though a priest’s daughter could if she returned home, widowed or divorced and without children.