'Guard' in the Bible

"Thus says Yahweh of hosts: 'If you will walk in my ways, and if you will keep my requirements, then you will judge my house, and you will also guard my courtyards, and I will give to you passageways among these that are standing here.

But I will encamp at my temple [like a] guard, against those crossing through and returning; no oppressor will cross through them again, for now I have seen with my [own] eyes.