וַיֹּ֤אמֶר אֵלָיו֙ דָּוִ֔ד דמיך [דָּמְךָ֖] עַל־רֹאשֶׁ֑ךָ כִּ֣י פִ֗יךָ עָנָ֤ה בְךָ֙ לֵאמֹ֔ר אָנֹכִ֥י מֹתַ֖תִּי אֶת־מְשִׁ֥יחַ יְהוָֽה׃ (ס)
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.’
Read kabbalistic (mystical) interpretation of II Samuel 1:16: and classical mystical sources.