Matthew 7:2-4
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.
Romans 12:20-21
But [Prov. 25:21-25 says], "Feed your enemy if he is hungry; give him something to drink if he is thirsty. For when you do this, it will be [like] heaping burning coals on his head." [i.e., it can cause him burning shame that can lead to his repentance and ultimate forgiveness].
1 Peter 4:17-18
For the time has [now] come for the house of God [the church, See I Tim. 3:15] to begin receiving judgment [i.e., by undergoing persecution], and if it starts with us [Christians], what will be the [ultimate] end of people who do not obey the Gospel of God?