'Body guard' in the Bible
Ahimelech replied to the king, "Who among all your servants is faithful like David? He is the king's son-in-law, the leader of your bodyguard, and honored in your house!
David replied to Achish, "That being the case, you will come to know what your servant can do!" Achish said to David, "Then I will make you my bodyguard from now on."
He received honor from the thirty warriors, though he was not one of the three elite warriors. David put him in charge of his bodyguard.
In the seventh year Jehoiada summoned the officers of the units of hundreds of the Carians and the royal bodyguard. He met with them in the Lord's temple. He made an agreement with them and made them swear an oath of allegiance in the Lord's temple. Then he showed them the king's son.
The royal bodyguard took their stations, each holding his weapon in his hand. They lined up from the south side of the temple to the north side and stood near the altar and the temple, surrounding the king.
He took the officers of the units of hundreds, the Carians, the royal bodyguard, and all the people of land, and together they led the king down from the Lord's temple. They entered the royal palace through the Gate of the Royal Bodyguard, and the king sat down on the royal throne.
He received honor from the thirty warriors, though he was not one of the three elite warriors. David put him in charge of his bodyguard.