Augustine of Hippo

That the tares are first separated, signifies that by tribulation the wicked shall be separated from the righteous; and this is understood to be performed by good Angels, because the good can discharge duties of punishment with a good spirit, as a judge, or as the Law, but the wicked cannot fulfil offices of mercy.

Catena Aurea by Aquinas ↗

Thomas Aquinas

Then he sets forth the end of both, at even as the weeds therefore are gathered up, etc. And first as to the wicked; secondly, as to the good; thirdly, he rouses them to a spiritual understanding. He says therefore even as the weeds are gathered up and burnt with fire, so shall it be at the consummation of the world.

Commentary on Matthew ↗