Yahweh continues to describe the sword of Yahweh which is a metaphor for the enemy army that Yahweh will use to attack Jerusalem. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This speaks of causing the people to be so terrified that it is as if their hearts were melting. AT: "to fill them with terror" or "to cause them to be terrified" (See: [[rc://en/ta/man/translate/figs-metaphor]])
# to multiply their fallen
Here "fallen" refers to the people killed in battle. This means there will be a greater number of people killed. AT: "to kill many people among them" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here the sword of Yahweh represents men with swords that are to attack Jerusalem. Also, the word "slaughter" can be expressed as a verb. AT: "placed soldiers armed with swords at their gates, ready to slaughter the people" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-abstractnouns]])
This compares how the sword is well polished and how it reflects light to appear like lightning. AT: "My sword is polished and flashes like lightning" or "It is polished and reflects light as being like lightning" (See: [[rc://en/ta/man/translate/figs-simile]])
The sword of Yahweh represents the men with swords that are to attack Jerusalem. AT: "released to slaughter the people" (See: [[rc://en/ta/man/translate/figs-metaphor]])