'Be Careful' in the Bible

And the statutes, and the ordinances, and the Law, and the commandment, which He wrote for you, you shall be careful to do forever. And you shall not fear other gods.

And I will not again make the feet of Israel wander any more out of the land which I gave their fathers; only if they will be careful to do according to all that I have commanded them, and according to all the Law that My servant Moses commanded them.