Musnad Abu Ya'la al-Mawsili 110:39

Narrated to us Sa'id ibn Yahya ibn Sa'id al-Umawi, he said: Narrated to me my father, narrated to us Ibn Jurayj, from 'Amr ibn Dinar, from 'Ikrimah, from Ibn 'Abbas, he said: The wrath of Allah intensified against one whom a Prophet of Allah killed in the way of Allah. And the wrath of Allah intensified against a people who caused the face of the Prophet of Allah, may Allah bless him and grant him peace, to bleed.