Sahih al-Bukhari 7066

Wāṣil reported from Abū Wāʾil, from ʿAbd Allāh—who, I believe, attributed it to the Prophet, peace and blessings be upon him—that he said: “Before the Hour there will be days of al-harj, when knowledge will disappear and ignorance will become prevalent.” Abū Mūsā said: “Al-harj means killing in the language of the Abyssinians.”