1 Samuel 26:8-10

8Then said Abishai to David, God hath delivered thy enemy into thy hand this day: now therefore let me smite him, I pray thee, with the spear even to the earth at once, and I will not smite him the second time.1 9And David said to Abishai, Destroy him not: for who can stretch forth his hand against the LORD’S anointed, and be guiltless? 10David said furthermore, As the LORD liveth, the LORD shall smite him; or his day shall come to die; or he shall descend into battle, and perish.