Bring forth him that hath cursed without the camp - All executions took place without the camp; and this arrangement probably originated in the idea that, as the Israelites were to be “a holy people” [Deu 7:6; Deu 14:2, Deu 14:21; Deu 26:19; Deu 28:9], all flagrant offenders should be thrust out of their society.
let all that heard him lay their hands upon his head, etc. - The imposition of hands formed a public and solemn testimony against the crime, and at the same time made the punishment legal.