2 Thessalonians 1:6

εἴπερ δίκαιον παρὰ Θεῷ ἀνταποδοῦναι τοῖς θλίβουσιν ὑμᾶς θλίψιν,

eiper dikaion para Theō antapodoynai tois thliboysin ymas thlipsin,

King James Version (KJV)

Seeing it is a righteous thing with God to recompense tribulation to them that trouble you;

Modern English

God is just: He will pay back trouble to those who trouble you