“the curse.” This could also be translated as, “I will send Curse against you,” as if Curse was a real being (it may be a real demon). The curse is in Deuteronomy 28:15-20 and following (see commentary on Deut. 28:20). Note that in Deuteronomy there is Curse, Confusion, and Rebuke,” and here in Malachi the priests and people are being disobedient and are under the curse (Mal. 2:2) and rebuke (Mal. 2:3).