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
Jerome
AD 420
Hence, “his blood will come upon him,” that is, he will be the cause of his own death, according to which principle David said to the one who had announced Saul’s death and had related that the king of Israel fell on his own sword: “Your blood be upon your head.” Not by my sentence, but by the blood of Saul will your blood be spilled.