Charles Ellicott Commentary Isaiah 16:4

"Let mine outcasts dwell with thee; as for Moab, be thou a covert to him from the face of the destroyer. For the extortioner is brought to nought, destruction ceaseth, the oppressors are consumed out of the land." — Isaiah 16:4 (ASV)

Let mine outcasts dwell with thee ... —Better, let the outcasts of Moab dwell with thee. Judah, as being herself in safety, is once more appealed to to show mercy to the Moabite fugitives. The “oppressors” are, literally, they that trample under foot.