This is the end of the message from Yahweh, spoken through the prophet Isaiah to King Hezekiah. It uses parallelism throughout. (See: [[rc://en/ta/man/translate/figs-parallelism]])
"Arrow" is metonymy representing all tools of warfare and destruction. AT: "nor do any fighting here" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Yahweh speaks of himself by name to express the certainty of what he is declaring. AT: "this is what Yahweh has declared" or "this is what I, Yahweh, have declared" (See: [[rc://en/ta/man/translate/figs-123person]])
# for my own sake and for my servant David's sake
"for the sake of my own reputation and because of what I promised to King David, who served me well"