And that whosoever would not come within three days, according to the counsel of the princes and the elders, all his substance should be forfeited, and himself separated from the congregation of those that had been carried away. All his substance should be forfeited - To the use of the temple.
So the Septuagint understood the place: Αναθεματισθησεται πασα ἡ ὑπαρξις αυτου, "All his substance shall be devoted to a holy use."
Himself separated - Excommunicated from the Church of God, and exiled from Israel.