1 Samuel 16:14-23 - After the account of David's anointing as King of Israel (at 10-15 years old) and before the account of David slaying Goliath, we see this account of God sending an evil spirit to Saul.  Wow!  Why would God do this?  Is God allowed to do such a thing?  Well, He is God!  Maybe God knows what He's doing and has something for you, and for your benefit, in the midst of everything you are going through.