The Lord tells Moses to speak to the Israelites about the Nazirite vow: a man or a woman who wishes to be set apart for the Lord for a time. During that period he must abstain from wine and every fermented drink, and from any product of the grape, fresh or dried. No razor may touch his head while the vow lasts: his long hair is the visible sign of his consecration.
The Nazirite also may not go near a dead body, not even that of his father, mother or siblings. If someone dies suddenly beside him and defiles his consecrated hair, he must shave his head on the seventh day, bring two turtledoves or two pigeons to the priest on the eighth, and begin his period of consecration again, without counting the earlier days. When the time is fulfilled he presents burnt, sin and peace offerings before the Lord, shaves his hair at the entrance of the tent of meeting and puts it on the fire of the peace offering. After that he may drink wine.
The second half of the chapter is a formula of blessing. The Lord commands Aaron and his sons to bless Israel with three lines: may the Lord bless you and keep you, may he make his face shine on you and be gracious to you, and may he lift up his face toward you and give you peace. In this way they will put the Lord's name on the Israelites, and he will bless them.