Albert Barnes on Matthew 25:32

And before him, etc. At his coming to judgment, the world will be burned up and destroyed, 2Pet 3:10,12, Rev 20:11. The dead in Christ, i.e., all true Christians--shall be first raised up from their graves, 1Thes 4:16. The living shall be changed --i.e., shall be made like the glorified bodies of those that are raised from the dead, 1Cor 15:52-54, 1Thes 4:17. All the wicked shall rise and come forth to judgment, Jn 5:28,29, Dan 12:2; Mt 13:41,42, Rev 20:13. Then shall the world be judged, the righteous saved, and the wicked punished.

And he shall separate, etc. Shall determine respecting their character, and shall appoint them their doom accordingly.

(w) "And before him" Rom 14:10, 2Cor 5:10, Rev 20:12 (x) "separate them" Eze 20:38, Mt 13:49 (y) "shepherd divideth" Ps 78:52, Jn 10:14,27