It is narrated from Hazrat Usaid bin Mutashams that he said: We were with Hazrat Abu Musa when the latter said, "Shall I not narrate to you a hadith which the Messenger of Allah (peace and blessings be upon him) used to narrate to us?" We said, "Why not." He said that the Messenger of Allah (peace and blessings be upon him) said: "The Hour will not be established until killing (harj) becomes widespread." We asked, "What is harj?" He (peace and blessings be upon him) said, "Killing, killing." We said, "Even now we kill." The Messenger of Allah (peace and blessings be upon him) said, "You will not be killing the disbelievers, rather a person will kill his neighbor, his brother, and his cousin." The narrator says, "This matter became difficult for us until we asked, 'Will we have intellect and awareness on that day?'" He (peace and blessings be upon him) said, "Most of the people of that time will have lost their intellects, and after them, foolish people will become their deputies, most of whom will think they are upon something (religious), but they will be upon nothing. By the One in Whose hand is my soul, I fear that some matters will afflict me and you, and if those matters reach us, there will be no way out for me and you except as we entered (meaning, we will not remain safe from those tribulations except as we were safe on the day we entered Islam)."