We know the prophet Elijah called fire down from heaven, killing bands of soldiers; and we know he slew the prophets of Baal at Mount Carmel. But his successor, Elisha, who had received the double portion of God's spirit, had a compassionate temperament who seems not to have been disposed to taking life.
Yet here we have the verse detailing the "swords":
And it shall come to pass, that him that escapeth the sword of Hazael shall Jehu slay: and him that escapeth from the sword of Jehu shall Elisha slay. (1 Kings 19:17, KJV)
Whom, then, having escaped the swords of Hazael and of Jehu, did Elisha slay?
NOTE: Both Hazael and Jehu literally slayed people, so if one chooses to interpret Elisha's part as symbolic, one needs to carefully support this.