1 Samuel 26:8-10

ISV(i) 8 Abishai told David, “Today God has delivered your enemy into your hand. Let me run the spear through him into the ground with a single blow. I won’t need to strike him twice!”
9 David told Abishai, “Don’t destroy him. Who can raise his hand to strike the LORD’s anointed and remain innocent? 10 As the LORD lives, the LORD will strike him down, or his time will come to die, or he will go into battle and perish.