6 Since it is a righteous thing with God to repay affliction to those who afflict you,
2 Thessalonians 1:6 Cross References - WEB
Exodus 23:22
22 But if you indeed listen to his voice, and do all that I speak, then I will be an enemy to your enemies, and an adversary to your adversaries.
Deuteronomy 32:41-43
41 if I sharpen my glittering sword, my hand grasps it in judgment; I will take vengeance on my adversaries, and will repay those who hate me.
42 I will make my arrows drunk with blood. My sword shall devour flesh with the blood of the slain and the captives, from the head of the leaders of the enemy.”
43 Rejoice, you nations, with his people, for he will avenge the blood of his servants. He will take vengeance on his adversaries, and will make atonement for his land and for his people.
Psalms 74:22-23
Psalms 79:10-12
10 Why should the nations say, “Where is their God?” Let it be known among the nations, before our eyes, that vengeance for your servants’ blood is being poured out.
11 Let the sighing of the prisoner come before you. According to the greatness of your power, preserve those who are sentenced to death.
12 Pay back to our neighbors seven times into their bosom their reproach with which they have reproached you, Lord.
Psalms 94:20-23
20 Shall the throne of wickedness have fellowship with you, which brings about mischief by statute?
21 They gather themselves together against the soul of the righteous, and condemn the innocent blood.
22 But Yahweh has been my high tower, my God, the rock of my refuge.
23 He has brought on them their own iniquity, and will cut them off in their own wickedness. Yahweh, our God, will cut them off.
Isaiah 49:26
26 I will feed those who oppress you with their own flesh; and they will be drunk on their own blood, as with sweet wine. Then all flesh shall know that I, Yahweh, am your Savior and your Redeemer, the Mighty One of Jacob.”
Zechariah 2:8
8 For Yahweh of Armies says: ‘For honor he has sent me to the nations which plundered you; for he who touches you touches the apple of his eye.
Colossians 3:25
25 But he who does wrong will receive again for the wrong that he has done, and there is no partiality.
Revelation 6:10
10 They cried with a loud voice, saying, “How long, Master, the holy and true, until you judge and avenge our blood on those who dwell on the earth?”
Revelation 11:18
18 The nations were angry, and your wrath came, as did the time for the dead to be judged, and to give your bondservants the prophets, their reward, as well as to the saints, and those who fear your name, to the small and the great, and to destroy those who destroy the earth.”
Revelation 15:4
4 Who wouldn’t fear you, Lord, and glorify your name? For you only are holy. For all the nations will come and worship before you. For your righteous acts have been revealed.”
Revelation 16:5-6
Revelation 18:20
20 “Rejoice over her, O heaven, you saints, apostles, and prophets; for God has judged your judgment on her.”
Revelation 18:24
24 In her was found the blood of prophets and of saints, and of all who have been slain on the earth.”
Revelation 19:2
2 for his judgments are true and righteous. For he has judged the great prostitute, who corrupted the earth with her sexual immorality, and he has avenged the blood of his servants at her hand.”