Good morning!
1st Samuel chapter 20.
Saul was so angry at David! Why? Jonathan, his son, asked him why he wanted to kill David but that resulted in Saul not answering the question but instead he became so angry and irrational that even tried to kill his son.
If Saul was rational in answering the question I feel like he would have said, “I want to kill David because I am so jealous and angry with God removing my kingdom from me. I know David will get the kingdom next. So if I could kill David then I can still claim kingship.”
David was a threat to Saul even with his popularity with the people.
You never hear Saul taking ownership for his poor behaviors. He lost his kingship because he was so self focused and not God focused.
His behavior actually reminded me of the Pharisees. They were so angry and jealous of Jesus and were intimidated by his increased popularity and their decreased popularity. As a result, they lost focus of the Truth. Our selfish focus blinds us of God's Truth. Must always be God Truth seekers.
Lord, help me to not get so self-focused that I lose sight of you and your Truth. Help me to be aware of my sinful and selfish thoughts. Help me to confess my sins verses trying to act self-righteous resulting in covering my sin.
Kimberly, you asked about “God Sending an Evil Spirit?”  I believe God didn't send the evil spirit as a way of “tempting” Saul but sent it as an act of judgment because of Saul's continual rebellion toward God.  Just a thought.