'Careful' in the Bible

and saying, "Be careful not to tell any one, but go and show yourself to the Priest, and for your purification present the offerings that Moses appointed as evidence for them."

Then He said to them, “Pay attention to what you hear. By your own standard of measurement [that is, to the extent that you study spiritual truth and apply godly wisdom] it will be measured to you [and you will be given even greater ability to respond]—and more will be given to you besides.

Jesus began to say to them, “Be careful and see to it that no one misleads you.

But when they shall lead you away to deliver you up, be not careful beforehand as to what ye shall say, nor prepare your discourse: but whatsoever shall be given you in that hour, that speak; for ye are not the speakers, but the Holy Spirit.

Be careful! I have told you everything ahead of time.

Be careful! Watch out! Because you don't know when the time will come.