Deuteronomy 21:23

He that is hanged is accursed of God - i. e. “Bury him that is hanged out of the way before evening: his hanging body defiles the land; for God’s curse rests on it.” The curse of God is probably regarded as lying on the malefactor because, from the fact of his being hanged, be must have been guilty of a especially atrocious breach of God’s covenant. Such an offender could not remain on the face of the earth without defiling it (compare Leviticus 18:25, Leviticus 18:28; Numbers 35:34). Therefore after the penalty of his crime had been inflicted, and he had hung for a time as a public example, the holy land was to be at once and entirely delivered from his presence. See Galatians 3:13 for Paul’s quotation of this text and his application of it.