2 Thessalonians 1:5-7

which is a manifest token of the righteous judgment of God; to the end that ye may be counted worthy of the kingdom of God, for which ye also suffer: if so be that it is a righteous thing with God to recompense affliction to them that afflict you, and to you that are afflicted rest with us, at the revelation of the Lord Jesus from heaven with the angels of his power in flaming fire