The word "You" refers to the mountain of Seir. Ezekiel is to speak to the mountain as if it can hear him. The message is for the people of Edom. AT: "Your people said" (See: [[rc://en/ta/man/translate/figs-personification]])
It is implied that Yahweh was protecting Israel and Judah. AT: "but Yahweh was there protecting Israel and Judah" (See: [[rc://en/ta/man/translate/figs-explicit]])