'Be Careful' in the Bible

Only be strong and very courageous so that you may be careful to do according to all the Law which My servant Moses commanded you. Do not turn from it to the right or to the left, so that you may act wisely wherever you go.

This book of the Law shall not depart out of your mouth, but you shall meditate on it by day and by night, so that you may be careful to do according to all that is written in it. For then you shall make your way prosperous, and then you shall act wisely.