The Apostle Paul
2 Thessalonians 1:9ESV·traditional attribution

They will suffer the punishment of eternal destruction, away from the presence of the Lord and from the glory of his might,

John Calvin Reformed @genevareformer

9. Everlasting destruction from the face. He shews, by apposition, what is the nature of the punishment of which he had made mention — destruction without end, and an undying death. The perpetuity of the death is proved from the circumstance, that it has the glory of Christ as its opposite. Now, this is eternal, and has no end. Accordingly, the influence of that death will never cease.

Matthew Henry Presbyterian @wholebiblehenry

Having mentioned their persecutions and tribulations, which they endured principally for the cause of Christ, the apostle proceeds to offer several things for their comfort under them; as, I. He tells them of the present happiness and advantage of their sufferings, Th2 1:5. Their faith being thus tried, and patience exercised, they were improved by their sufferings, insomuch that they were counted worthy of the kingdom of God.

Commenting on 2 Thessalonians 1:5-10

John Gill Reformed Baptist @doctorgill

Who shall be punished with everlasting destruction,.... With destruction both of soul and body, though not with the annihilation of either; their gnawing worm of conscience will never die, and the fire of divine wrath will never be quenched; the smoke of their torment will ascend for ever.