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 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 18:6
Give back to her the way [i.e., the kind of treatment] she has given back [to others], and repay her double for what she has done. Mix a double dose for her from her own cup.