'Guard' in the Bible

so King Rehoboam made small copper shields in place of them and {entrusted them} to the commanders of the royal guard who keep the doorway of the king's house.

Whenever the king came [to] the house of Yahweh, the royal guard carried them and brought them back to the alcove room of the royal guard.

As the king [was] passing by, he called to the king and said, "Your servant went out in the thick of the battle, and suddenly a man turned and brought a man to me and said, 'Guard this man. If by any means he should be missed, it will be your life in his place, or you shall pay a talent of silver.'