en_tn/psa/037/015.md

Their swords will pierce their own hearts

Swords are examples of weapons and "hearts" represent the people. To "pierce the heart" is an idiom that means "to kill." AT: "Their weapons will be turned against them and they will kill themselves" (See: rc://en/ta/man/translate/figs-synecdoche and rc://en/ta/man/translate/figs-idiom)