'Fortify' in the Bible

The prophet visited the king of Israel and instructed him, "Go, fortify your defenses. Determine what you must do, for in the spring the king of Syria will attack you."

He said to the people of Judah: "Let's build these cities and fortify them with walls, towers, and barred gates. The land remains ours because we have followed the Lord our God and he has made us secure on all sides." So they built the cities and prospered.

Because you favor Zion, do what is good for her! Fortify the walls of Jerusalem!