Sending fear into their hearts represents making them afraid. Alternate translation: "I will make you terribly afraid" (See: [[rc://en/ta/man/jit/figs-metaphor]])
The sword represents either someone who is ready to kill using a sword or an attack from an enemy army. Alternate translation: "as though you were fleeing from someone who was chasing you with a sword" or "as though you were fleeing from an enemy army" (See: [[rc://en/ta/man/jit/figs-metonymy]])