2 Thessalonians 1:6
For it is a just thing for God to repay with affliction those people who are troubling you,
Matthew 7:2
For the way you judge [other people] is the way you [yourselves] will be judged. And the standard you use [for dealing] with others is the standard that they [and God] will use on you.
James 2:13
For the person who has shown no mercy will be judged without mercy. [For] mercy wins out over condemnation.
Revelation 13:10
If anyone goes [or "leads others"] into captivity, he will go into captivity [himself]; if anyone is killed [or "kills others"] with the sword, he will be killed with the sword [himself]. Here is [where] God's holy people [need] perseverance and faith.
Revelation 16:6
For they [i.e., the followers of the beast. See verse 2] have shed the blood of God's holy people and [their] prophets, and you have given them blood to drink because they deserved it [i.e., these persecutors deserved the punishment they received for shedding blood].
Revelation 19:2
For His judgments are true and just; He has judged [i.e., condemned] the great prostitute who corrupted the earth with her sexual immorality, and He has punished her for [shedding] the blood of His servants."