From Sahih Bukhari (Hadith 7066):
Narrated `Abdullah:The Prophet (ﷺ) said, "Near the establishment of the Hour, there will be the days of Al-Harj, and the religious knowledge will be taken away (vanish i.e. by the death of Religious scholars) and general ignorance will spread." Abu Musa said, "Al-Harj, in the Ethiopian language, means killing
Reference: Bukhari 7066