Matthew Henry Commentary Deuteronomy 21:22-23

"And if a man have committed a sin worthy of death, and he be put to death, and thou hang him on a tree; his body shall not remain all night upon the tree, but thou shalt surely bury him the same day; for he that is hanged is accursed of God; that thou defile not thy land which Jehovah thy God giveth thee for an inheritance." — Deuteronomy 21:22-23 (ASV)

By the law of Moses, the touch of a dead body was defiling. Therefore, dead bodies must not be left hanging, as that would defile the land.

One reason for this relates to Christ: He that is hanged is accursed of God—which is to say, this is the highest degree of disgrace and reproach.

Those who saw a man hanging in this way, between heaven and earth, would conclude he was abandoned by both and unworthy of either.

Moses, by the Spirit, used this phrase "accursed of God"—which, in its original context, meant simply being treated with extreme disgrace—so that it might later be applied to the death of Christ. This application would demonstrate that in His death, He underwent the curse of the law for us. Such a revelation proves His love and encourages faith in Him.