Histories

Two of the seven flung into the room with him, Darius and Gobryas; as Gobryas and the Magus wrestled together, Darius stood helpless in the darkness, afraid of stabbing Gobryas.

Gobryas, seeing Darius stand helpless, asked why he did not lend a hand; and he said, “Because I am afraid for you, that I might stab you.” And Gobryas answered, “Stick your sword even if it goes through us both.” So Darius complying stabbed with his knife and somehow stuck the Magus.

When they had killed the Magi and cut off their heads, they left their wounded there because of their infirmity and for the sake of guarding the acropolis, while five of them carrying the Magi's heads ran outside with much shouting and commotion, calling all Persians to aid, telling what they had done and showing the heads; at the same time they killed every Magus that came in their way.