Jamieson, Fausset and Brown on Isaiah 49:24

24. the prey--Israel, long a prey to mighty Gentile nations, whose oppression of her shall reach its highest point under Antichrist (Da 11:36, 37, 41, 45).

lawful captive--the Jews justly consigned for their sins (Is 50:1) as captives to the foe. Secondarily, Satan and Death are "the mighty" conquerors of man, upon whom his sin give them their "lawful" claim. Christ answers that claim for the sinners, and so the captive is set free (Job 19:25; 14:14; Mt 12:29; Ho 6:2, where Is 49:4 shows the primary reference is to Israel's restoration, to which the resurrection corresponds; Is 26:19; Ep 4:8; He 2:14, 15). Others not so well translate, "the captives taken from among the just Israelites."