'Guard' in the Bible

Then David came to his house (palace) at Jerusalem, and the king took the ten women, his concubines whom he had left to take care of the house, and placed them under guard and provided for them, but did not go in to them. So they were confined, and lived as widows until the day of their death.

He was honored among the thirty, but he did not attain to the [greatness of the] three. David appointed him over his guard.