2 Samuel 1:16

And David said unto him, Thy blood [be] upon thy head; for thy mouth hath testified against thee, saying, I have slain the LORD'S anointed.

Ver. 16. Thy blood be upon thy head.] For though Saul desired thee to despatch him, as thou hast said, and volenti non fit iniuria: yet because he was felo de se, as lawyers now speak, a suicide, it was not lawful for thee to help him out of the world, although the enemy had given him his death wound, and he therefore desired it of thee. Say that there was no wrong hereby done to Saul's self, yet wrong was done to God the Lord of Saul's life, as also to the commonwealth whereof Saul was the head; so saith Aquinas. a

Saying, I have slain the Lord's anointed.] A just hand of God upon this Amalekite, for his lying.

a Tho. iii. p. 9, 47, ar. vi. ad. 3.