shall be a fire] God attributeth this power, to consume his enemies, to his Church, which power is onely proper to himself, as Isaiah 10:17. Deuteronomy 4:24. Hebrews 12:29. they shall kindle in them] The Church, by the power of Christ and his Spirit, shall as easily consume the enemies, represented under the person of the Idumeans, as fire doth kindle when it taketh hold of some combustible matter.