'Body guard' in the Bible

David said to Achish, "Very well, you will know what your servant can do." Achish said to David, "Very well, I will make you {my bodyguard} for life."

He [was] honored more than the thirty, but he did not come up to the three. David appointed him in charge of his bodyguard.

He himself was certainly distinguished among the thirty, but he did not attain to the three. And David appointed him over his bodyguard.