NASB 1995
dealing out retribution to those who do not know God and to those who do not obey the gospel of our Lord Jesus.

American Standard Version
rendering vengeance to them that know not God, and to them that obey not the gospel of our Lord Jesus:

Berean Study Bible
in blazing fire, inflicting vengeance on those who do not know God and do not obey the gospel of our Lord Jesus.

Douay-Rheims Bible
In a flame of fire, giving vengeance to them who know not God, and who obey not the gospel of our Lord Jesus Christ.

English Revised Version
in flaming fire, rendering vengeance to them that know not God, and to them that obey not the gospel of our Lord Jesus:

King James Bible
In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:

World English Bible
giving vengeance to those who don't know God, and to those who don't obey the Good News of our Lord Jesus,

Young's Literal Translation
in flaming fire, giving vengeance to those not knowing God, and to those not obeying the good news of our Lord Jesus Christ;

2 Thessalonians 1:8 Additional Translations ...