Yahweh continues speaking.
Here “them” refers to the people along the coastlands.
Yahweh is compared with a warrior who is ready to defeat his people’s enemies. (See: rc://en/ta/man/translate/figs-simile and rc://en/ta/man/translate/figs-parallelism)
Here “zeal” refers to the passion that a warrior experiences when he is about to fight a battle. Yahweh stimulating his zeal is spoken of as if he stirred it up like the wind stirs up waves of water. (See: rc://en/ta/man/translate/figs-metaphor)