'Be on Your Guard' in the Bible

Meanwhile, the LORD had spoken to Ahijah, "Be on your guard! Jeroboam's wife is coming to ask you about her son, because he is ill. You're to say such and such to her. When she arrives, she will pretend to be someone else!"

So let the fear of the LORD rest upon you, be on your guard, and act carefully, because with the LORD our God there is neither injustice, nor partiality, nor bribery."

"As for yourselves, be on your guard! People will hand you over to local councils, and you will be beaten in their synagogues. You will stand before governors and kings to testify to them because of me.

So be on your guard! I've told you everything before it happens."

"Constantly be on your guard so that your hearts will not be loaded down with self-indulgence, drunkenness, and the worries of this life, or that day will take you by surprise

And so, dear friends, since you already know these things, continuously be on your guard not to be carried away by the deception of lawless people. Otherwise, you may fall from your secure position.