In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:
Berean Study Bible (BSB) - 2 Thessalonians 1:8 >in blazing fire, inflicting vengeance on those who do not know God and do not obey the gospel of our Lord Jesus.
Textus Receptus (TR) - 2 Thessalonians 1:8 >ἐν πυρὶ φλογός, διδόντος ἐκδίκησιν τοῖς μὴ εἰδόσι Θεόν, καὶ τοῖς μὴ ὑπακούουσι τῷ εὐαγγελίῳ τοῦ Κυρίου ἡμῶν Ἰησοῦ Χριστοῦ·