I don't pretend to be a Biblical scholar. I read the Good-Book and ask questions. Sometimes I stumble across things that I find interesting and want to share them.
One word that gets bandied about in the tail-feathers of the Bible is the word "justified'. It shows up in Paul's letters, most especially in Romans.
The modern nuance of the word "justified" is "well, considering all of the extenuating factors the action is not one we will prosecute". That is not how Paul uses the word.
It has been helpful to me to substitute "...made righteous..." or "...righteous..." for the word justified.
The modern sense of a "justified" shooting is a shooting where the target might have presented a risk of mortal danger or risk to limb.
The modern sense of a "righteous" shooting is a shooting where the target presented a clear-and-present danger to innocents: A thug pointing a loaded pistol at a pregnant woman's belly or an arsonist throwing Molotov Cocktails into a crowded tenement or firing into a school.
Satan
Another word that drifted is the word "Satan".
The most common understanding of the word Satan in the Old (aka, Jewish) Testament was as "Stumbling block" or obstacle. If you accept this definition, then the parable of the seeds falling among the briers (an obstacle to progress) and the beaten path takes an interesting twist. The way to find God is somewhere between the two extremes.
When Jesus told Peter "Satan, get behind me..." he was using the word in this sense. if Jesus accepted Peter's counsel he would not be able to fulfill his mission. Peter was an obstacle not the Evil-One incarnate.
The Old Testament book that gives us the closest look at "Satan" is Job. In that book, Satan slyly proposes that men glorify God based on a quid pro quo relationship. God objects and poor, old Job takes a beating. The book of Job has been a great comfort for the less fortunate throughout the ages.
The common understanding of the word "Satan" pivoted as Christianity expanded and encountered competing religions. Many of the attributes of "Satan", i.e. cloven hooves, horns, tail, tridents.... resemble the accoutrements of Druidic and Greek "gods".
The amalgam of Revelations and mish-mash of displaced gods became the popular image of Satan.
That is not to diminish Satan's power. His first appearance is in Genesis where he separates Adam and Eve from paradise by appealing to their weakness. We were created in the image-and-likeness of God. Sadly, we fail to see that we cannot BE God even as we are drawn to be like him.
Bonus link
Judge
Another word that drifted in meaning since Biblical times is "Judging".
The general sense I get from the Bible is that to "judge" was to assume (or perhaps curse) somebody into eternal damnation. If you "judged" them as unclean or not making-the-cut for salvation then you were sinning because you made them something less than human.
Paul is a good example of why we should not judge. He held the cloaks of the people stoning early Christians, yet through God's grace became one of the pillars of the church. Should we "judge" the 20 year-old tool who carries an "Abortion is cool" sign to protest those who are holding prayer vigils outside of abortion clinics?
While we cannot know the state of her soul when she slips her mortal coil, we can exercise discernment. Discernment is a critical skill in our mission to be good stewards. It is improper (in my universe) to condemn people for exercising "discernment". After all...is condemning the very "judging" the Bible prohibits