And David said unto him, Your blood be upon your head; for your mouth has testified against you, saying, I have slain the LORD'S anointed.
All Commentaries on 2 Samuel 1:16 Go To 2 Samuel 1
John Cassian
AD 435
We know that David went beyond the precepts of the law when, despite Moses’ command to pay back one’s enemies in kind, he not only did not do this but even embraced his persecutors in love, prayed devoutly to the Lord on their behalf, even wept mournfully for them and revenged them when they were slain.