Deuteronomy 21:6

In this chapter provision is made, I. For the putting away of the guilt of blood from the land, when he that shed it had fled from justice (Deu 21:1-9). II. For the preserving of the honour of a captive maid (Deu 21:10-14). III. For the securing of the right of a first-born son, though he were not a favourite (Deu 21:15-17). IV. For the restraining and punishing of a rebellious son (Deu 21:18-21). V. For the maintaining of the honour of human bodies, which must not be hanged in chains, but decently buried, even the bodies of the worst malefactors (Deu 21:22, Deu 21:23).

21:6 wash their hands: This ancient practice asserted innocence (cp. Matt 27:24); by it the community would declare that it was not responsible for a crime committed in its vicinity.