2 Thessalonians 1:6

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

Since it is a righteous thing with God to repay affliction to those who afflict you,

if so be that it is righteous thing with God to recompense affliction to them that afflict you,

since `it is' a righteous thing with God to give back to those troubling you -- trouble,

After all, it is only right for God to repay with affliction those who afflict you,