'Guard' in the Bible

So the Lord God took the man [He had made] and settled him in the Garden of Eden to cultivate and keep it.

So God drove the man out; and at the east of the Garden of Eden He [permanently] stationed the cherubim and the sword with the flashing blade which turned round and round [in every direction] to protect and guard the way (entrance, access) to the tree of life.

Meanwhile, in Egypt the Midianites sold Joseph [as a slave] to Potiphar, an officer of Pharaoh and the captain of the [royal] guard.

Now Joseph had been taken down to Egypt; and Potiphar, an Egyptian officer of Pharaoh, the captain of the [royal] guard, bought him from the Ishmaelites, who had taken him down there.

He put them in confinement in the house of the captain of the guard, in the same prison where Joseph was confined.

The captain of the guard put Joseph in charge of them, and he served them; and they continued to be in custody for some time.

Now there was with us [in the prison] a young man, a Hebrew, servant to the captain of the guard; and we told him, and he interpreted our dreams for us, to each man according to the significance of his own dream.