John Trapp on Isaiah 21:2

Ver. 2. A grievous Viſion] Heb. Hard, harſh; tyrannorum ſpeculum: here's hard for hard; God loveth to retaliate. Babylon had been the maul of the earth, Jer: 51.20. now a hard Meſſenger is ſent, a harſh Viſion is declared againſt her. They who do what they ſhould not, ſhall hear what they would not; a burdenous Propheſie, a grievous Viſion! This treacherous dealer dealeth treacherouſly, and this ſpoyler ſpoyleth: for ſo ſome read the next words.

The treacherous dealer dealeth treacherouſly] Or, O thou treacherous dealer and notable ſpoyler: thou Elam I mean, go up thou Media, beſiege. God oft maketh uſe of one Tyrant to puniſh another: as here he ſtirreth up the Perſians to plunder and waſte the Babylonians. So the Perſians were afterwards in like ſort puniſhed by the Macedonians, the Macedonians by the Romans thoſe Romans by the Hunnes, Vandals, Lombards, Sarazens, Turks: all whom Chriſt ſhall deſtroy at his laſt coming.

Go up, O Elam] i.e. Thou Perſian: Elymais is properly that part of Perſia that lyeth towards Media. Here they are appointed their work, 170. years before it was done: and Cyrus afterwards named as the chief doer.

All the ſighing thereof have I made to ceaſe] Thereof, or of her, that is, of Babylon, (not of Judaea, which the Prophet ever had in his heart, as ſome ſence it) the ſighing,Vatab. quo ipſa, ſua tyrannide & appreſſione, cogebat alios flere & gemere, that ſhe forced from others, ſpecially from Gods oppreſſed people. Or, they ſhall not have long to ſigh, for I will ſoon put an end to their lives.