Yahweh speaks of himself by name to express the certainty of what he is declaring. See how you translated this in [Jeremiah 1:8](../01/07.md). AT: "this is what Yahweh has declared" or "this is what I, Yahweh, have declared" (See: [[rc://en/ta/man/translate/figs-123person]])
Here "hand" refers to power or control. This can be translated in active form. AT: "the men you fear will not harm you" or "I will not allow anyone to put you under the control of the people whom you fear" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-activepassive]])
The sword is a metonym for dying in war. AT: "No one will kill you with their sword" or "You will not die in war" (See: [[rc://en/ta/man/translate/figs-euphemism]] and [[rc://en/ta/man/translate/figs-metonymy]])