'Guard' in the Bible

Now concerning everything which I have said to you, be on your guard; and do not mention the name of other gods, nor let them be heard from your mouth.

“Behold, I am going to send an angel before you to guard you along the way and to bring you into the place which I have prepared.

Be on your guard before him and obey his voice; do not be rebellious toward him, for he will not pardon your transgression, since My name is in him.