The Lord commanded Moses to tell the Aaronite priests, “No priest is to make himself ritually unclean by taking part in the funeral ceremonies when a relative dies,
He has been dedicated to me and is not to make himself ritually unclean nor is he to defile my sacred Tent by leaving it and entering a house where there is a dead person, even if it is his own father or mother.
Those who touch a corpse and do not purify themselves remain unclean, because the water for purification has not been thrown over them. They defile the Lord's Tent, and they will no longer be considered God's people.
“Command the people of Israel to expel from the camp everyone with a dreaded skin disease or a bodily discharge and everyone who is unclean by contact with a corpse.
Your hair is the sign of your dedication to God, and so you must not defile yourself by going near a corpse, not even that of your father, mother, brother, or sister.
If your consecrated hair is defiled because you are right beside someone who suddenly dies, you must wait seven days and then shave your head; and so you become ritually clean.
But there were some people who were ritually unclean because they had touched a corpse, and they were not able to keep the Passover on that day. They went to Moses and Aaron