'Be on Your Guard' in the Bible

And ye shall be on your guard as to everything that I have said unto you; and shall make no mention of the name of other gods it shall not be heard in thy mouth.

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.

“Only be on your guard and diligently watch yourselves, so that you don’t forget the things your eyes have seen and so that they don’t slip from your mind as long as you live. Teach them to your children and your grandchildren.

so he told him: “My father Saul intends to kill you. Be on your guard in the morning and hide in a secret place and stay there.

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."

"Let everyone be on your guard against his neighbor, and you must not trust in any brother, for everyone surely betrays, and every neighbor goes about [with] slander.

Thus says Yahweh, "Be on your guard for the sake of yourselves, that you must not carry a burden on the day of the Sabbath, and you must [not] bring [it] through the gates of Jerusalem.

Blow the horn in Gibeah,The trumpet in Ramah [the lofty hills on Benjamin’s northern border].Sound the alarm at Beth-aven:“Behind you and coming after you [is the enemy], O Benjamin [be on guard]!”