'Careful to Observe' in the Bible

"Be careful to observe every command that I'm instructing you today, in order that you may live, increase, and enter and take possession of the land that the LORD promised by an oath to your ancestors.

Now as to everything I'm commanding you, you must be careful to observe it. Don't add to or subtract from it."

and if you are careful to observe all these commands that I am commanding you today to love the LORD your God and to walk daily in his ways then add three more cities in addition to these three cities.

"In cases of leprosy, be very careful to observe exactly what the Levitical priests instructed you. Carefully follow what I have commanded them.

"If you aren't careful to observe all the words of this Law that have been written in this book, instructing you to fear this glorious and awesome name of the LORD your God,