This means that Joab sent someone with a message to Tekoa and had him bring back a woman to him. This can be written in active form. Alternate translation: "sent someone with a message to Tokoa and had him bring a wise woman back" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-activepassive]])
This refers to someone who has died, not dead people in general. Alternate translation: "someone who has died" (See: [[rc://en/ta/man/translate/figs-nominaladj]])