1 Samuel 24:5-6King James Version (KJV)
5 And it came to pass afterward, that David's heart smote him, because he had cut off Saul's skirt.
6 And he said unto his men, The Lord forbid that I should do this thing unto my master, the Lord's anointed, to stretch forth mine hand against him, seeing he is the anointed of the Lord.
1 Samuel 26:8-10King James Version (KJV)
8 Then said Abishai to David, God hath delivered thine enemy into thine 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.
9 And David said to Abishai, Destroy him not: for who can stretch forth his hand against the Lord's anointed, and be guiltless?
10 David 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.