1 Samuel 27:8

1 Samuel 27:8 says, And David and his men went up, and invaded the Geshurites, and the Gezrites, and the Amalekites: for those nations were of old the inhabitants of the land, as thou goest to Shur, even unto the land of Egypt. After being given a city to operate from, David and his men began to make war against those around him.  These were enemies of Israel that Matthew Henry says were so evil that God had already decided on their destruction and that David was ordained to destroy them.  In my understanding of God's word, we as followers of Christ today are not called on to destroy any group of people, even if they are our enemies, but like Jesus Himself are to reach out to them with the love of God.  This is not to say that at times we may not find ourselves having to go to war with them to keep God's word from being destroyed.  Verse nine adds, And David smote the land, and left neither man nor woman alive, and took away the sheep, and the oxen, and the asses, and the camels, and the apparel, and returned, and came to Achish.  David and his men killed all the people of the Geshurites and Gezrites and took all their possessions.  They may have needed these things, but we are not told that David consulted God before doing this.  Just because we see someone as an enemy and may need what they have doesn't mean that it is God's will for us to attack them and take it.  Verse ten continues, And Achish said, Whither have ye made a road to day? And David said, Against the south of Judah, and against the south of the Jerahmeelites, and against the south of the Kenites.  When Achish asked David where he had been fighting, he lied to him.  David said he had been fighting against his own people.  Matthew Henry said David may have lied to keep the Philistines from fearing him and also to make Achish think his actions would have made the people of Israel hate him.  I don't believe there is ever a time when we as Christians can make people think we hate and have been attacking other Christians just to keep ourselves safe.  If we are following God's will in what we do, we need to be honest about what we are doing.  Verse eleven states, And David saved neither man nor woman alive, to bring tidings to Gath, saying, Lest they should tell on us, saying, So did David, and so will be his manner all the while he dwelleth in the country of the Philistines.  David had killed everyone so there would be  no one left to take the news of what he had done to the Philistines.  David certainly wasn't acting like an honorable man of God in this whole situation.  I believe that we as followers of Christ must act honorably in all that we do.  Otherwise,  God's name could be disparaged.  Verse twelve adds, And Achish believed David, saying, He hath made his people Israel utterly to abhor him; therefore he shall be my servant for ever.  Achish believed David,  and saw what he thought David had done as giving him an advantage over David.  Achish said David’s own people would hate him, and David would be his servant forever.  Though lying brought about a good result for David, that does not mean that it was justified before God.  We need to remember that Satan is the father of lies and God is the God of truth.