'Guard' in the Bible

When David came to his palace in Jerusalem, he took the 10 concubines he had left to take care of the palace and placed them under guard. He provided for them, but he was not intimate with them. They were confined until the day of their death, living as widows.

Amasa was not on guard against the sword in Joab’s hand, and Joab stabbed him in the stomach with it and spilled his intestines out on the ground. Joab did not stab him again for Amasa was dead. Joab and his brother Abishai pursued Sheba son of Bichri.