But David said to Abishai, "Do not destroy [Saul]; for who can stretch out his hand against the LORD's anointed, and be guiltless?" (1 Samuel 26:9)
In the Name + of Jesus. Amen. Saul hated David. Although David hadn't done anything, every chance he got, Saul tried to kill David. Now it was David's turn. He had the opportunity to run Saul through with his spear while he slept. He surely deserved it. Do it! But he didn't do it because Saul was still the king.
Every day you have opportunities to get even with people who do something to you. "I'll steal this music online since the music companies are just ripping us off anyway." "She said that about me but wait 'til I post on her wall!" "The company won't pay us overtime so it won't hurt them if I swipe a few items from them." "He started it. But I'm going to finish it!"
But consider this: Whatever you have against someone else for which you think you ought to collect, the Lord could have that much more on you for which HE ought to collect. But the judgment of God will not strike you down. After all, you are the Lord's anointed as Saul was. Sure, you're not the king of Israel, but you ARE anointed in your Baptism as a child of God--one whose sins have been wiped out for good.
That's because the Lord's anointed WAS struck. Who was more anointed above everyone than Jesus? He was the Messiah (Hebrew for "anointed") and the Christ (Greek for "anointed.") And He was struck down with every ounce of God's wrath as if He deserved it. For your sins. For your sake. For you, the Father struck His anointed Son on Calvary to blot out your sins. And then, at the holy font, God anointed you with water and the Word and called you His own.
Now, not sin, nor death, nor the devil, nor anyone had dare mess with you because you are the Lord's anointed. In Christ, you are sealed with the Spirit for everlasting life and even if death strikes you down, the Lord will raise you up by the power of the resurrection of Jesus, the Son of David and your Savior. In the Name + of Jesus. Amen.
Hail to the Lord's anointed, Great David's greater Son! Hail, in the time appointed, His reign on earth begun! He comes to break oppression, To set the captive free, To take away transgression And rule in equity. (Hail to the Lord's Anointed, LSB 398:1)