It is narrated from Sayyiduna Abu Wa'il (may Allah be pleased with him), he says: I was sitting with Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and Sayyiduna Abu Musa (may Allah be pleased with him), both of them said that the Messenger of Allah (peace and blessings be upon him and his family) said: Before the Day of Judgment, there will come a time in which ignorance will become widespread, knowledge will be taken away, and Harj will become common. We asked: What is meant by Harj? He (peace and blessings be upon him and his family) said: Killing.