Therefore the children of Israel can't stand before their enemies; they turn their backs before their enemies, because they are become accursed: I will not be with you any more, except you destroy the devoted thing from among you.
The burning of a criminal after his stoning was one way of emphasizing the wickedness of his crime (Leviticus 20:14; cf. Deuteronomy 13:15-16). It was a "disgraceful thing" (Joshua 7:15) to steal something under the ban (devoted to God).