The Lord instructed Moses to have the offender taken outside the camp. This is the place of the defiled and unclean (Leviticus 13:46). There, the witnesses of the blasphemy lay their hands on the man. This is a visible sign that the guilt and responsibility of the sin rests with the one who has blasphemed. Thereafter the entire community stones the man to death. The corporate nature of this punishment highlights that blaspheming the name of the Lord will not be tolerated at all in Israel.
14 Fais sortir du camp le blasphémateur; tous ceux qui l'ont entendu poseront leurs mains sur sa tête, et toute l'assemblée le lapidera.