G-d created the entire concept of metal work. A smith forges implements of war, but we need not fear those who wield them. Any weapon held against Israel will fail; anyone who speaks against them will be defeated. This is the reward of those who have served G-d.
Isaiah tells all who are thirsty to go to the water and all those with no money to go buy food - it will not be an impediment. (As in many places, the food and drink are a metaphor for Torah.) Why should you work and pay for no food? Listen to G-d and eat your fill of goodness. Turn towards Him and live, enjoying an eternal covenant.
David's descendant (Moshiach - the Messiah) will chastise the nations and rule over them. You will call a nation you don't know and they will come because they've heard about the miracles G-d has performed for Israel.
Excerpted from The OU's Nach Yomi