וְשָׁמַ֨ע הַשֹּׁמֵ֜עַ אֶת־ק֤וֹל הַשּׁוֹפָר֙ וְלֹ֣א נִזְהָ֔ר וַתָּ֥בוֹא חֶ֖רֶב וַתִּקָּחֵ֑הוּ דָּמ֥וֹ בְרֹאשׁ֖וֹ יִֽהְיֶֽה׃
나팔 소리를 듣고도 경비를 하지 아니하므로 그 임하는 칼에 제함을 당하면 그 피가 자기의 머리로 돌아갈 것이라
Rashi
his blood will be on his own head The iniquity of causing his death will be required of himself, because he was neglected his life.