'Life guard' in the Bible

And the Midianites sold him into Egypt, to Potiphar, a chamberlain of Pharaoh, the captain of the life-guard.

And Joseph was brought down to Egypt; and Potiphar, a chamberlain of Pharaoh, the captain of the life-guard, an Egyptian, bought him of the hand of the Ishmaelites who had brought him down thither.

and he put them in custody into the house of the captain of the life-guard, into the tower-house, into the place where Joseph was imprisoned.

And the captain of the life-guard appointed Joseph to them, that he should attend on them. And they were several days in custody.

Pharaoh was wroth with his bondmen, and put me in custody into the captain of the life-guard's house, me and the chief of the bakers.

And there was there with us a Hebrew youth, a bondman of the captain of the life-guard, to whom we told them, and he interpreted to us our dreams; to each he interpreted according to his dream.