'Guard' in the Bible

because Herod feared John, knowing that he was a righteous and holy man, and he continually kept him safe. When he heard John [speak], he was very perplexed; but he enjoyed listening to him.

Jesus repeatedly ordered them, saying, “Watch out! Beware of the leaven of the Pharisees and the leaven of Herod.”

But be on your guard; I have told you everything in advance.

“Be on guard and stay constantly alert [and pray]; for you do not know when the appointed time will come.