'Defend' in the Bible

"Here's what we'll do: A third of you will enter here on this coming Sabbath dressed as guardians of the watch for the king's palace, with a third of you at the Sur gate, and a third at the gate behind the guards. Keep watch over the palace and defend it.

"I will defend this city and preserve it for my own reasons, and because of my servant David.'"

Furthermore, I'll add fifteen years to your life. I'll deliver you and this city from domination by the king of Assyria, and I'll defend this city for my own sake and for the sake of my servant David."'"